I've done a ton of canyon-carving with my LGT Wagon, in the SoCal mountains, and I've never had an issue with my MPS ASes, through 35-40K miles, on each of three sets (one 17" set, two 18" sets). Sidewall/edge wear sounds more like bad alignment settings, i.e. toe-in/out front/rear
Pro dilectione Dei et patriam
Last edited by SBT; 10-23-2012 at 07:29 PM..