We pull a Silverado 1500 with a long wide bed and an extended cab. No problems with the 450 HP Cummins, but be advised you'll be overlength in a bunch of states. We've pulled overlength for about 200,000 miles without a problem, but I do not go into California, for a LARGE number of reasons, length among them.
2013 Tiffin Allegro Bus 43QGP
2011 Chevy Silverado 1500 Toad