In 6-weeks I will be in glamis riding the Dunes! I have a Kenda Geko rears 21x11x10 on ITP wheel. The fronts are Dune trackers 22x8x10 on ITP wheels. Is this a good set up for the dunes. I was thinking about getting 22x11x10 rears. Am I going to be OK or should i get the larger rears. Also what tire preasure should I run in fronts and rears.