I'm planning on buying new rims and tires for my truck and I'm not sure what back spacing is needed. This is mostly a daily driver which only plays in mud. I've got 10bolt, front and rear, and a 4 inch "rough-ride country" lift. I currently have 15x8 rims and 35x12.50 Mickey Thompson MTX's. (they suck in the mud!) I'm want to get 35x14.50 but it will probably rub. So I guess I'm stuck with 35x12.50 mud terrains. What size rim would I need 15x10 or 15x8? What back spacing?