[m1a convert]

I am going to build this with a 4X4 foot box.

I was looking at using 1/2 torsion axles so i wouldn't have an axle running from wheel to wheel.

http://www.etrailerpart.com/halftorsionaxles.htm

Will these be strong enough to take the punishment they will take off road with 33-35 inch tires on them? I was thinking of the 1400 lb axle.

[Geeps]

I think Tentrax uses similar axles.

http://www.tentrax.com/OffRoadAT_Trailer.html

[pendleton]

Will these be strong enough to take the punishment they will take off road with 33-35 inch tires on them? I was thinking of the 1400 lb axle.

While there are some inherent differences in forces present between, for example, a P225-75-R15 and a 35-12.50 R15 tire, I don't think it will be as critical as you would think. If you think about it, a bigger tire actually has some characteristics that ease the punishment on the torsion housings.

Bigger tires roll over the rough stuff easier, not hanging up as much.
Bigger tires rotate slower, i.e. bearing not spinning as much, reducing heat while on the road.

While jeeps require built up axles to power tires of this size, a trailer only has to hold them along for the ride. I think the biggest thing you will have to worry about with the larger tires is just their brute weight. It takes a little more strength to hold a 35" tire on a straight line going down the road as opposed to a passenger tire. Also, if the tire gets bogged in mud, it has more resistance due to suction, (more surface area), than the passenger tire. All in all, I don't think you would have much of a problem with the torsion housings as long as they are rated for what your trailer is intended for.

I would love to hear other's thoughts on this.

(BTW, the safety rating on hardware like trailer parts is usually very high)