Adding axle to single axle trailer - Great Lakes 4x4. The largest offroad forum in the Midwest

Go Back   Great Lakes 4x4. The largest offroad forum in the Midwest > 4x4 Talk > Tow rigs and trailers
GL4x4 Live! GL4x4 Casino

greatlakes4x4.com is the premier Great Lakes 4x4 Forum on the internet. Registered Users do not see the above ads.
Search
Reply
 
Thread Tools Search this Thread
Old April 19th, 2017, 06:35 PM   #1
alexdummy
Typical Millennial
 
alexdummy's Avatar
 
Join Date: 04-15-14
Location: Holland
Posts: 2,774
iTrader: (6)
Mentioned: 14 Post(s)
Default Adding axle to single axle trailer

Alright who has done it? I've got a single axle boat trailer and I'd really like to add another axle for multiple reasons. It doesn't seem like it would be too terribly hard. Has anyone ever done it? It seems more cost effective than trying to find the right dual axle trailer.

alexdummy is offline   Reply With Quote
Sponsored Links
Advertisement
 
Old April 19th, 2017, 09:07 PM   #2
Mihlfeldl2005
Life=Short. Jeeps=Cool
 
Mihlfeldl2005's Avatar
 
Join Date: 10-04-11
Location: Fowlerville, MI
Posts: 3,153
iTrader: (15)
Mentioned: 14 Post(s)
Send a message via Yahoo to Mihlfeldl2005 Send a message via Skype™ to Mihlfeldl2005
Default

There's a couple of reasons why you might not want to do that for that boat trailer.

I'm assuming you're trying to get better tracking behind your vehicle, right? A second axle would definitely help with that but the added stress on that hull may cost you the boat in the long run.

Boat trailers are more often sized by weight and length than anything else, the reason behind this is because fiberglass hulls are prone to stress fractures and cracking. Your suspension is setup to allow the weight of the boat to properly cycle the suspension on the trailer. Adding a second axle and not increasing the weight of the boat will make the suspension stiffer and can cause a bit of a bounce effect on the trailer as a whole. This can lead to stress fractures, cracking, etc.

Just my two cents

Sent from my SM-G930T using Tapatalk
Mihlfeldl2005 is offline   Reply With Quote
Old April 19th, 2017, 09:17 PM   #3
Lousypirate
Whoop Whoop
 
Lousypirate's Avatar
 
Join Date: 02-11-08
Location: Marne 49435
Posts: 16,668
iTrader: (45)
Mentioned: 66 Post(s)
Default

I'll gladly take the boat off your hands so you can add another axle to it


Sent from my iPhone using Tapatalk
__________________



The Kernel (46 CJ2a)

Do-All Ex Welding Truck (98 Chevy 3500)

Quote:
Originally Posted by Gunsworth View Post
Wow, i would lick those...
Lousypirate is offline   Reply With Quote
 
Old April 20th, 2017, 03:26 AM   #4
alexdummy
Typical Millennial
 
alexdummy's Avatar
 
Join Date: 04-15-14
Location: Holland
Posts: 2,774
iTrader: (6)
Mentioned: 14 Post(s)
Default

Quote:
Originally Posted by Mihlfeldl2005 View Post
There's a couple of reasons why you might not want to do that for that boat trailer.

I'm assuming you're trying to get better tracking behind your vehicle, right? A second axle would definitely help with that but the added stress on that hull may cost you the boat in the long run.

Boat trailers are more often sized by weight and length than anything else, the reason behind this is because fiberglass hulls are prone to stress fractures and cracking. Your suspension is setup to allow the weight of the boat to properly cycle the suspension on the trailer. Adding a second axle and not increasing the weight of the boat will make the suspension stiffer and can cause a bit of a bounce effect on the trailer as a whole. This can lead to stress fractures, cracking, etc.

Just my two cents

Sent from my SM-G930T using Tapatalk
Ya I was thinking about changing out leaf springs to help compensate with that. The boats came with dual axles from the factory, it was an option but finding one is near impossible.
alexdummy is offline   Reply With Quote
Old April 20th, 2017, 05:51 AM   #5
montecarlo33
The Violator
 
montecarlo33's Avatar
 
Join Date: 08-23-07
Location: Otsego County 49735
Posts: 5,038
iTrader: (22)
Mentioned: 4 Post(s)
Default

Finding another trailer would be cheaper i assume, once you buy one and sell that one. Boat trailer axles are usually different then most and hard to match up. IMO adding another axle to that trailer i believe you would get alot of "axle float" where one axle wouldn't touch alot of the time. Maybe a drop hitch would be a good place to start for now. Phoenix trailers out of east jordan is who our marina uses to make custom ski boat and float on pontoon trailers, weve never had an issue with them yet.
montecarlo33 is offline   Reply With Quote
Old April 20th, 2017, 07:58 AM   #6
whiterhino
I'm not old, honest...
 
whiterhino's Avatar
 
Join Date: 03-07-06
Location: Davisburg MI
Posts: 27,389
iTrader: (24)
Mentioned: 131 Post(s)
Default

Quote:
Originally Posted by Mihlfeldl2005 View Post
There's a couple of reasons why you might not want to do that for that boat trailer.

I'm assuming you're trying to get better tracking behind your vehicle, right? A second axle would definitely help with that but the added stress on that hull may cost you the boat in the long run.

Boat trailers are more often sized by weight and length than anything else, the reason behind this is because fiberglass hulls are prone to stress fractures and cracking. Your suspension is setup to allow the weight of the boat to properly cycle the suspension on the trailer. Adding a second axle and not increasing the weight of the boat will make the suspension stiffer and can cause a bit of a bounce effect on the trailer as a whole. This can lead to stress fractures, cracking, etc.

Just my two cents

Sent from my SM-G930T using Tapatalk
Good advice
whiterhino is offline   Reply With Quote
Old April 20th, 2017, 08:00 AM   #7
Mihlfeldl2005
Life=Short. Jeeps=Cool
 
Mihlfeldl2005's Avatar
 
Join Date: 10-04-11
Location: Fowlerville, MI
Posts: 3,153
iTrader: (15)
Mentioned: 14 Post(s)
Send a message via Yahoo to Mihlfeldl2005 Send a message via Skype™ to Mihlfeldl2005
Default

Quote:
Originally Posted by whiterhino View Post
Good advice
Thanks Jim!

Sent from my SM-G930T using Tapatalk
Mihlfeldl2005 is offline   Reply With Quote
Old April 20th, 2017, 08:18 AM   #8
kickstand
circling the drain
 
kickstand's Avatar
 
Join Date: 09-20-06
Location: circling the drain
Posts: 35,291
iTrader: (47)
Mentioned: 120 Post(s)
Default

How does adding a 2nd axle add more stress to the hull?

If that boats hull can't handle the stress of riding on a trailer with 2 axles I certainly don't want to ride in it at the 65-75 MPH speeds it should be capable of out on the water.....

Further, nearly every boat manufacturer out there offers a dual axle trailer as an option even for super light weight fiberglass boats.....

I'm not saying you're wrong, I'm just saying that you are contradicting what many fiberglass boat makers sell boats with, if it was a problem I would think they wouldn't do that....

Also, in my experience dual axle trailers ride much smoother and bounce a lot less than a single axle, which to me would make me think the boat would see less stress, not more.
kickstand is offline   Reply With Quote
Old April 20th, 2017, 08:28 AM   #9
koochman450r
Senior Member
 
koochman450r's Avatar
 
Join Date: 03-13-08
Location: New Boston MI
Posts: 3,397
iTrader: (29)
Mentioned: 2 Post(s)
Default

that's what I was thinking. Smashing into 2' chop at 50mph puts more stress on that then bunks that support majority of hull. But I would put lighter springs and another axle for sure
__________________
Quote:
Originally Posted by clarkstoncracker View Post
you won this battle.
koochman450r is online now   Reply With Quote
Old April 20th, 2017, 08:38 AM   #10
whiterhino
I'm not old, honest...
 
whiterhino's Avatar
 
Join Date: 03-07-06
Location: Davisburg MI
Posts: 27,389
iTrader: (24)
Mentioned: 131 Post(s)
Default

Quote:
Originally Posted by Mihlfeldl2005 View Post
There's a couple of reasons why you might not want to do that for that boat trailer.

I'm assuming you're trying to get better tracking behind your vehicle, right? A second axle would definitely help with that but the added stress on that hull may cost you the boat in the long run.

Boat trailers are more often sized by weight and length than anything else, the reason behind this is because fiberglass hulls are prone to stress fractures and cracking. Your suspension is setup to allow the weight of the boat to properly cycle the suspension on the trailer. Adding a second axle and not increasing the weight of the boat will make the suspension stiffer and can cause a bit of a bounce effect on the trailer as a whole. This can lead to stress fractures, cracking, etc.

Just my two cents

Sent from my SM-G930T using Tapatalk
I'm guessing that as a guy who works at a boat dealership, they have seen this happen.

With that, I would think it would only apply to a boat trailer that has localized pads vs a full length bunk. And I agree that the spring rates should probably change.
whiterhino is offline   Reply With Quote
Old April 20th, 2017, 08:46 AM   #11
Mihlfeldl2005
Life=Short. Jeeps=Cool
 
Mihlfeldl2005's Avatar
 
Join Date: 10-04-11
Location: Fowlerville, MI
Posts: 3,153
iTrader: (15)
Mentioned: 14 Post(s)
Send a message via Yahoo to Mihlfeldl2005 Send a message via Skype™ to Mihlfeldl2005
Default

Quote:
Originally Posted by kickstand View Post
How does adding a 2nd axle add more stress to the hull?

If that boats hull can't handle the stress of riding on a trailer with 2 axles I certainly don't want to ride in it at the 65-75 MPH speeds it should be capable of out on the water.....

Further, nearly every boat manufacturer out there offers a dual axle trailer as an option even for super light weight fiberglass boats.....

I'm not saying you're wrong, I'm just saying that you are contradicting what many fiberglass boat makers sell boats with, if it was a problem I would think they wouldn't do that....

Also, in my experience dual axle trailers ride much smoother and bounce a lot less than a single axle, which to me would make me think the boat would see less stress, not more.
Actually most of the manufacturers that we deal (Glastron, Crownline, Bayliner, Scarab, Ski Supreme, and Heyday) with don't offer tandem axle options on the smaller boats for the exact reason that it's just too much trailer for the boat.

You also have to remember that when in contact with the water it has a much larger area of contact than it will with the bunks on the trailer.

Not saying it can't work though. Just pointing out some things to be cautious of. If it's an aftermarket trailer then the likely hood of the bunks being in the exact factory locations that match up with the stringer system on the inside of the hull are low. This can also effect hull stress cracks.

Sent from my SM-G930T using Tapatalk
Mihlfeldl2005 is offline   Reply With Quote
Old April 20th, 2017, 09:35 AM   #12
kickstand
circling the drain
 
kickstand's Avatar
 
Join Date: 09-20-06
Location: circling the drain
Posts: 35,291
iTrader: (47)
Mentioned: 120 Post(s)
Default

Quote:
Originally Posted by Mihlfeldl2005 View Post
Actually most of the manufacturers that we deal (Glastron, Crownline, Bayliner, Scarab, Ski Supreme, and Heyday) with don't offer tandem axle options on the smaller boats for the exact reason that it's just too much trailer for the boat.

You also have to remember that when in contact with the water it has a much larger area of contact than it will with the bunks on the trailer.

Not saying it can't work though. Just pointing out some things to be cautious of. If it's an aftermarket trailer then the likely hood of the bunks being in the exact factory locations that match up with the stringer system on the inside of the hull are low. This can also effect hull stress cracks.

Sent from my SM-G930T using Tapatalk

Clearly you don't have much of an idea of how much of the pictured boat is in contact with the water when out running. Nor the amount of stress it is seeing at the speeds it is capable of.

A bunked trailer has far more contact than that boat will have with the water over 40 mph.

And manufacturers like Hydrostream, STV, Quartershot, Progressive, Action, and others do all offer tandem trailers, for boats, like the one pictured.
kickstand is offline   Reply With Quote
Old April 20th, 2017, 09:37 AM   #13
kickstand
circling the drain
 
kickstand's Avatar
 
Join Date: 09-20-06
Location: circling the drain
Posts: 35,291
iTrader: (47)
Mentioned: 120 Post(s)
Default

Quote:
Originally Posted by whiterhino View Post
I'm guessing that as a guy who works at a boat dealership, they have seen this happen.

With that, I would think it would only apply to a boat trailer that has localized pads vs a full length bunk. And I agree that the spring rates should probably change.
He sells pontoon boats, fishing boats and bayliners.....
kickstand is offline   Reply With Quote
Old April 20th, 2017, 09:38 AM   #14
Mihlfeldl2005
Life=Short. Jeeps=Cool
 
Mihlfeldl2005's Avatar
 
Join Date: 10-04-11
Location: Fowlerville, MI
Posts: 3,153
iTrader: (15)
Mentioned: 14 Post(s)
Send a message via Yahoo to Mihlfeldl2005 Send a message via Skype™ to Mihlfeldl2005
Default

Quote:
Originally Posted by kickstand View Post
Clearly you don't have much of an idea of how much of the pictured boat is in contact with the water when out running. Nor the amount of stress it is seeing at the speeds it is capable of.

A bunked trailer has far more contact than that boat will have with the water over 40 mph.

And manufacturers like Hydrostream, STV, Quartershot, Progressive, Action, and others do all offer tandem trailers, for boats, like the one pictured.
Right, not saying it's not possible. But we have definitely seen problems arise in the past from conditions like these. If he adjusts the spring rate on the axles when he installs them he should have no issues.

Sent from my SM-G930T using Tapatalk
Mihlfeldl2005 is offline   Reply With Quote
Old April 20th, 2017, 09:42 AM   #15
whiterhino
I'm not old, honest...
 
whiterhino's Avatar
 
Join Date: 03-07-06
Location: Davisburg MI
Posts: 27,389
iTrader: (24)
Mentioned: 131 Post(s)
Default

Quote:
Originally Posted by kickstand View Post
He sells pontoon boats, fishing boats and bayliners.....
Nothing wrong with a guy sharing his experiences. It's good advice to "at least" be aware of a potential problem. Will it be a problem with that particular hull? Most likely not. But still no harm in making the OP aware.
whiterhino is offline   Reply With Quote
Old April 20th, 2017, 10:01 AM   #16
kickstand
circling the drain
 
kickstand's Avatar
 
Join Date: 09-20-06
Location: circling the drain
Posts: 35,291
iTrader: (47)
Mentioned: 120 Post(s)
Default

Quote:
Originally Posted by whiterhino View Post
Nothing wrong with a guy sharing his experiences. It's good advice to "at least" be aware of a potential problem. Will it be a problem with that particular hull? Most likely not. But still no harm in making the OP aware.
That's fine, but he's referencing Bayliners and chopper gun boats, when the OP has posted a picture of what is most likely a hand laid hull that isn't built for pulling little johnny around on a tube.

His advice may bring up a potential issue, I asked him why he thought that....

Sure I was a dick about it, but I felt like being one, I've thought most of his advice about boats has been misplaced. His experience around boats is great and all, but I'd think he'd know the difference between a boat that has a hi-po outboard hanging off the back and the fishing boats and pontoons he sells.
kickstand is offline   Reply With Quote
Old April 20th, 2017, 11:42 AM   #17
Mihlfeldl2005
Life=Short. Jeeps=Cool
 
Mihlfeldl2005's Avatar
 
Join Date: 10-04-11
Location: Fowlerville, MI
Posts: 3,153
iTrader: (15)
Mentioned: 14 Post(s)
Send a message via Yahoo to Mihlfeldl2005 Send a message via Skype™ to Mihlfeldl2005
Default

Quote:
Originally Posted by kickstand View Post
That's fine, but he's referencing Bayliners and chopper gun boats, when the OP has posted a picture of what is most likely a hand laid hull that isn't built for pulling little johnny around on a tube.

His advice may bring up a potential issue, I asked him why he thought that....

Sure I was a dick about it, but I felt like being one, I've thought most of his advice about boats has been misplaced. His experience around boats is great and all, but I'd think he'd know the difference between a boat that has a hi-po outboard hanging off the back and the fishing boats and pontoons he sells.
No offense taken, I've got thick skin and a good attitude. Delamination can occur in any fiberglass hull though, whether it be a cheap Bayliner or a Tiara Yacht. Michigan has a rather harsh climate and the temperature changes can cause contraction and expansion differences between the hull and stringers of a boat.

This creates voids in the hull that are essentially weak points in the fiberglass. So even though the OP's boat is most likely a hand laid hull, it doesn't mean that it's impervious to common issues.

I think we've both given sound advice to the OP.

Sent from my SM-G930T using Tapatalk
Mihlfeldl2005 is offline   Reply With Quote
Old April 20th, 2017, 11:51 AM   #18
Mihlfeldl2005
Life=Short. Jeeps=Cool
 
Mihlfeldl2005's Avatar
 
Join Date: 10-04-11
Location: Fowlerville, MI
Posts: 3,153
iTrader: (15)
Mentioned: 14 Post(s)
Send a message via Yahoo to Mihlfeldl2005 Send a message via Skype™ to Mihlfeldl2005
Default

Quote:
Originally Posted by alexdummy View Post
Alright who has done it? I've got a single axle boat trailer and I'd really like to add another axle for multiple reasons. It doesn't seem like it would be too terribly hard. Has anyone ever done it? It seems more cost effective than trying to find the right dual axle trailer.

For cost comparison sake, What're the specifications on the boat? I can look into what a tandem axle trailer would cost so you can weigh the difference between adding an axle or just getting a new trailer.

Sent from my SM-G930T using Tapatalk
Mihlfeldl2005 is offline   Reply With Quote
Old April 20th, 2017, 12:28 PM   #19
kickstand
circling the drain
 
kickstand's Avatar
 
Join Date: 09-20-06
Location: circling the drain
Posts: 35,291
iTrader: (47)
Mentioned: 120 Post(s)
Default

Quote:
Originally Posted by Mihlfeldl2005 View Post
For cost comparison sake, What're the specifications on the boat? I can look into what a tandem axle trailer would cost so you can weigh the difference between adding an axle or just getting a new trailer.

Sent from my SM-G930T using Tapatalk
I'd be surprised if that boat weighed more than 2k with motor
kickstand is offline   Reply With Quote
Old April 20th, 2017, 12:30 PM   #20
kickstand
circling the drain
 
kickstand's Avatar
 
Join Date: 09-20-06
Location: circling the drain
Posts: 35,291
iTrader: (47)
Mentioned: 120 Post(s)
Default

Quote:
Originally Posted by Mihlfeldl2005 View Post
No offense taken, I've got thick skin and a good attitude. Delamination can occur in any fiberglass hull though, whether it be a cheap Bayliner or a Tiara Yacht. Michigan has a rather harsh climate and the temperature changes can cause contraction and expansion differences between the hull and stringers of a boat.

This creates voids in the hull that are essentially weak points in the fiberglass. So even though the OP's boat is most likely a hand laid hull, it doesn't mean that it's impervious to common issues.

I think we've both given sound advice to the OP.

Sent from my SM-G930T using Tapatalk
I never said it wasn't susceptible to rot or delanination, but you're still talked GM about chopper gun production boats.

Which this could be, I can't quite make out the name on the side or recall exactly which hill that is as it's a popular mid 80's/90's hull designed manufactured by quite a few different companies.
kickstand is offline   Reply With Quote
Reply
Great Lakes 4x4. The largest offroad forum in the Midwest > 4x4 Talk > Tow rigs and trailers

Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump


All times are GMT -5. The time now is 04:46 PM.


Powered by: vBulletin, Copyright 2000 - 2012, Jelsoft Enterprises Ltd.
User Alert System provided by Advanced User Tagging (Lite) - vBulletin Mods & Addons Copyright © 2017 DragonByte Technologies Ltd. Runs best on HiVelocity Hosting.
vBulletin Security provided by vBSecurity v2.2.2 (Pro) - vBulletin Mods & Addons Copyright © 2017 DragonByte Technologies Ltd.
 
Page generated in 0.45684 seconds with 84 queries