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.

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