[GX150]

22x10-8 trires will fit without issue on on standard 8x8 rims. What is the size of the front tires? 18x?-?

8x5 4/4 trailer tires are common:

http://recstuff.com/8x5.375-4-4-blac...ler-wheel.aspx
http://recstuff.com/8x5375-4-4-white...ler-wheel.aspx
http://www.summitracing.com/parts/DTG-005-27/