Toyo MT
From what I see Cali wheeling is all about the mud. Not too much rock. Toyo's would work really nice.
I've got BFG TA KO's which I'll be testing in the rocky wilds of Paragon AP this weekend. I expect great things!
I would have gotten the Toyo's but they weren't readilly available in my area and would have busted my budget. If you can swing 'em, get the Toyo's.