The way sand sucks power, I would stick with the 31x10.5 for sure. You need to air down no matter what tire size you have anyway. I run my 33x9.50 BFG AT's in the sand at 10-12psi and they do a nice job.


84 4RUNNER,22R,HEDMAN,WEBER 32/36,Davis Unified Ignition,33" BFG