Ok, I got the Michelin LTX M/S installed this morning and my truck now rides like a Cadillac. It cost me some $$ though. My story is different than most. My dealer had the shop next door install BFG AT 285/55/R20 10 ply before I took delivery (charged me $800 with trade for SRA's). Mine would vibrate the passenger seat badly at 70-80mph. When I took the truck to the dealer for vibration (fire recall & clunk in rear end) they rebalanced (road force) the BFG's again, and said they were within spec. I still had same vibration. I took it back to the tire store and paid $324 additional for the LTX's. The truck doesn't look as good with the 275/55/R20, but I would do anything to get rid of the vibration.