I did my research and couldnt really find the answer I was looking for so, I am planning on selling the wheels and tires the guy had on my 4runner 33x12.50 Super Swampers (Im not sure about the wheels), and running the same size wheel and tire. 15x8 black rocks and 33x12.50 BFG KM2's or Goodyear MTR's with Kevlar. So the question is should I go with a 4" backspace or a 3 3/4" backspacing? I guess I really have 2 questions the other is which tire should I go with.