jstrubberg wrote:My question would be, why have an axle tube at all? It's more weight and cuts into ground clearance by a lot.
I'm sure there's a reason, but why aren't stub axles more popular for these lightweight trailers?
Three reasons:
1. Alignment - keeping the two stub axles aligned along a common centerline (and equidistant from the tongue) so you don't have toe-in.
2. Camber - without the tubular steel connecting the two stubs, it is difficult to install with equal camber.
3. Frame loading - again, without the connection, the forces of the weight of the trailer and traveling over bumps in the road will cause the stub axles to rotate around the outer frame rail (perpindicular to the trailer.)
Many trailers have been built with stub axles, but most have are bolted to a structural member that spans the width of the trailer to address the three issues above. So it becomes a trade-off. Does your design work better with a "standard" torsion axle or stub axles with a frame crossmember?