i have some 38x14.50x15 PJ dirt grips on my DD it is a 94 chevy extended cab, but they are good on road, good in the dirt, decent in mud, havent really tried too much rocks or sand with them, but im happy with them so far.
but they are a bit on the pricy side.
i just had to buy one because i was doin somthin stupid on poped it, and it was like 370 for 1 tire mounted and ballenced.(he only charged me like 8 bucks to mount and ballence it)