I am looking o purchase a new pickup truck so I can tow a trailer or fifth wheel that my Chevy Tahoe cannot. So I am looking at a Chevy Silverado 2500, with the 6.3 liter engine, or maybe even the diesel. I love the mountains, but live in Texas. I am seeking advice on all aspects of a new vehicle. Crew cab or double cab? Lengthy of box? Do I let the dealership install the mounting for a 5th wheel hitch, or an RV dealership? Those whom already own a pickup, what do you like, and what do you regret not having?