Thinking I want to upgrade from my '05 GMC Sierra Z71 Crew Cab and towing a 2012 Keystone 28RBS(31 footer). Tows OK going down the highway but shifts down and revs like crazy on the interstate driving. Since I would like to get some longer trips in, we are thinking of a 3/4 ton crew cab. Only get about 3-7,000 miles annually right now.
What do you suggest/recommend and why as far as Gas vs Diesel? Would like to stay above 2006 but thinking below the emissions in the '08, '09+ area.
Thanks