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Old October 5th, 2007, 08:16 PM   #1
dngrous_Jeep
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Default building a utility trailer....

Okay, I'm getting some leaf springs checked tomorrow afternoon for their spring rate, so I'll know how big of a trailer I can build on them. Now for the tech part. What would be considered the minimum thickness for framerails on a small trailer?
I'm guessing this trailer will be 10-12' long when finished, and roughly 5-5.5' wide.
GF's dad has some heavy-duty shelving supports behind his shop that have been sitting there for quite a while. They don't have anything beyonf surface rust on them, but will they be thick enough for framerails?
We'll probably be using the rear axle from a mid-80s Dodge Caravan, and the rest will be kitbashed together. I've got a complete set of lights for it, and it will most likely use treated lumber for the deck.

Also, what sort of pipe should I be looking around for, for the tongue? Like I said, GF's dad has quite a bit of steel laying around, and I have a 7' piece of 1.5" or 1.75" HREW pipe, with probably a .25" wall thickness.
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Old October 6th, 2007, 04:08 PM   #2
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The polls are in, and they'll easily hold up 3K# for each side.

Thoughts?
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Old October 7th, 2007, 10:42 AM   #3
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Minimum 3/16" frame and enough bracing to keep the frame from twisting. Remember that a 3d structure is stronger than a 2d structure.
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Old October 7th, 2007, 01:08 PM   #4
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Even if the weight is distributed over more than two framerails? I may be able to use two shorter framerails towards the center of the trailer, tied together to the outer rails. The leaves will be mounted on the outer rails, and probably at reinforced points.

I think the steel I'm thinking of is about 1/8" thick, but it's also not just regular box tubing, either. It has a few 90 degree bends in it on one side, so it "should" be stiffer than most.

I'll get pics of the steel I'll be using later today, and probably a quick sketch of the frame plans.
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Old October 7th, 2007, 06:30 PM   #5
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Well you can probably get away with 1/8" if you build it right and stiffen the frame properly. I am using 3/16" on my trailer but I also have a lot of it and have a simple trailer design.
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