Â*"What would be wrong with, say, doubling the wheel base length?"

if you visit the MM Fabrication website and find the page with WingRigger options, you will see that it IS offered with a wide-track chassis. The bottom tube that holds the hardened chrome axle is seven inches longer and incorporates three linear bearings instead of the two in the standard chassis. The axle is also correspondingly longer. Stability is improved, although few customers opt for this choice. The wide-track is standard on WingRiggers sold for large gliders, but is available for an additional $75.