Need new rears for my TRI-Z. I was thinking about getting the Dunlop KT335 Tires, they are 4 ply and a Radial. Just put a new front on, a Kenda Klaw K532, which is a 6 ply Radial. What ply do you guys run on the rears? I was also thinking about going to a 20x10x9 on the back of this. Stock size is 21x11x9.