Nothing.
Use the truck to haul a overhead camper and tow a stock trailer or boat. You can't even tell the campers on the truck, still gets 16mpg, rides great, tows and pulls better than the previous several dodge diesels we had with no death wobble, front end failures, tranny failures, injector pump failures, lift pump failures, electrical system failures, no need for air bags and sway bars, no cracking apart bed sheet metal bla, bla, bla.
Tired of buying the latest fad and throwing $$ into it in repairs? go back to the real deal for 1/3 the cost. Silverado Classic HD = #1.
I would also like to testify regarding this well-built truck. My '06 2500HD handles a Bigfoot overhead truck camper well, with excellent gas mileage to boot averaging 14 miles/gallon. I've had it for over 12000 miles, with no faults. This really is an affordable, dependable hauling machine!
I tow a heavy boat 200 miles on many weekends to the beach with mine and love my new Silverado as well. The comfortable ride is the best feature. If you have a diesel the addition of a chip can increase your mpg.
I find it hard to believe that this truck can outpull a dodge diesel.. considering the dodge has 600 ft. pounds of torque.
Note: A Comments RSS Feed 
is available. New comments appear in the Members Area before the main site