The 10.5Wx31 should hook at your power and weight. Any bigger will just slow it down. Depends on converter slip for your trap RPM. Mines about 7300@150 with a 4.30 10.5wx31. I'd love to run a wider rim as mine are only 10". Not enough room. Been numerous 1.25 60ft this year (foot brake 3345lbs). Last 2 passes were 1.25, 85 passes on the tires. I'll bet there's even more left if we tighten up the shocks. Doug
