it takes allot of horse power to run them, I used to run tires like your talking about with the ribs those were great tires, I think they were called desert tracks. You could take your doors off and run some 31 inch real wide tires and you might do better, just do the silicon sealer on the bead trick and air way down. I just picked up several sets of large tires with 15 inch wide wheels for me to do some testing with outback this winter with two inch spacers, I have four ply terra tires eight ply terra tires and some 18.5 wide stock car tires to mess with, I was looking for the 24 inch wide but so far no luck on those, will try some steel cable on them if needed for more traction these are going to be used just for fun and experiment kind of thing. I have an extra tub laying outback also so if needed may cut the back off it and make a 6x6 and see how that does, may need to drink lots of redbull!