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If torsion axles are so great, why do the serious off roader's pulling trailers choose leaf springs?
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I'd guess the geometry. A single trailing arm holds the wheel parallel to the body. A leaf spring holds them perpendicular to the surface (whatever that might be doing).
I designed a teardrop trailer with 4 10-12" wheels on two-wheel bogies on single pivots on a rigid cross-member.
Here's an aerodynamic study:
http://xinzhang.ust.hk/research_proj...roject13_1.png