The guy Dale doesn't know
i have always used straps in the past, but am sick of them breaking on me. i just recently started using chains and binders. what do you guys use?
4 straps to the axles, one for each corner. Use an axle sling for each strap, so your straps don't wear on the axles. Each strap should be pulling away from the others. That way, each keeps tension on each other strap. Bumps can shift a load, so this arrangement makes sure to keep it tight.
Myself, I feel you can't be too careful. I've never had a problem in 10 years of towing my rigs, but I've seen many failures. Its a very good idea to stop after driving the few 5 miles, to check the tension on all of them (as well as the bearing, brake, and tire temps, especially if the trailer hasn't been used in a while). Then check everything each time you stop.
The only time I've had a load start to get loose, was a Honda CRX, that didn't have easy spots to tie to the suspension, so I tied to the frame shipping hook points. As the body bounces, it loosens the straps. But I caught it on my 5 mile check before it got too loose.
Another note on straps, make sure you click the ratchet handle all the way into the locked position. Some folks aren't aware that there is a lock position on them (clicked all the way closed).