Just bought a 2001 Chevrolet 2500 HD LT 6.6 4X4Duramax. Needs tires soon. Currently LT285 75R16 M+S on it. Any suggestions for good highway tire? No off roading. Will be towing 8,000 lb. fifth wheel. Anyone with experience with Michelin LTX M/S??? I've used Michelins before on Pathfinder and got great ride and mileage.