Look at ATV and golf cart tires for more options. I have gone through probably a dozen pairs of tires in getting what I wanted in terms of soft ride and traction on my machines and small hub wheels with ATV snow (stud) treads work best for both applications. Shopping the www one can find good deals.
My last purchase was the Deestone D929 22/1100-8, 4 ply, not 2, 5 psi rated at 50 mph (I run 12 psi at 10 mph on a 1300# ZT) from Simple Tire.com...$31 ea. Super traction and very soft ride. Also, offset wheels are available where the mounting disc is offset from the center of the wheel. Most are 3" from the inner rim and the outer distance varies as to the width of the wheel....like the 8" offset wheels I bought to mount said tires are a 3:5.