Planning on getting a 13 Pro RMK for this fall. Looking for some input on track sizes. I'm 6'8 about 265lbs w/gear and trying to pick between a 155 and 163. The only thing keeping me from the 163 is that when we have snow in MN I would like to ride the sled on the flat lands also. Sled will be stock except for maybe a can,shocks,and cluthing upgrades. Does anyone know the overall length difference between the 155 and 163?