Per Hi Lo Pro (a/c 17008), this model takes a pneumatic tire 12 x 16.5. His cust. wanted a solid crossover. Lee Ray said an 8.00 x 16 should work provided it has a split/lockring rim w/beadseat of 6". Overall od of 8.00 x 16 is 32".
Mark may/may not try. I told him we'd be interested to know how it worked for them.