I recently put OME 614's on the front with coach's +3 in the back. When looking at the truck from the rear the driver's side of the bed is noticeably lower than the passenger side. I know coach makes shims, but I was thinking that I may want more rake. Could I use... say a 1.5" block on the LH and a 1" block on the RH to get more rake and level it out? Would this cause any issues? Would there be any problems? I really do not want to have to go the airbag route. Thanks for any help guys!