On my first trailer I rotary ground two HONDA 13" wheels, with 165/ 70 SR 13 steel radials, to fit a Harbor Freight 4-foot utility trailer.
I managed to create an upper body, but nothing else.
Towed behind my CRX, I dead-headed out to Los Angeles, California, picked up some Ni-Cads from a local hospital, and made the return trip, at the weight of a Ford Taurus, returning an average 50-mpg at 55-mph, versus 52-mpg 'naked.'
I've no idea what it would have done with the original 8" bias-ply tires.
http://https://ecomodder.com/forum/m...ets-50-mpg.jpg