Geoff:
Dual axels do not necessarily improve traction. They improve the floatation and may keep you from sinking into a surface, but you need enough psi on a tire surface to get the tread to work and deform a bit, to get a grip on a surface.
My post on building my own, the combination of aggresive tread and single axel dramaticly improved my traction on slipper surfaces.
JMHO
good luck on your venture.
Chuck
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