Remove that heavy GM-Brembo brake package kit and install the normal OEM brake, rotors and pads. Those things are heavy as hell! I added them to my 6.2 RST and feel a difference in ride quality. Still smooth but I feel more road imperfections than before. I believe the RST sport edition comes with 20 inch wheels and not 22 so wheel size is not a big factor here. The regular versions of this truck on 22s ride smooth.