1500hd trucks are kind of a rare bird - GM built the 1500hd series trucks from '01 to maybe '04 before they started building the standard 1500 crew cab. Rather than being based on the 1500, they were based on the 2500. Same frame, same axles, same engine, transmission, transfer case, coolers... same everything except slightly lighter springs, so they sit a bit lower. Unless you read the 1500 tag, you'll assume it's a 2500 - full 6 1/2' bed, 8 lug wheels, etc... They were GM's quick fix for a market that wanted a half ton with a full crew cab. GM probably was wise in knowing that most buyers of this type truck would be towing with it, but eventually the buyers wanting a lighter, shorter wheelbase truck won out, and the 1500hd's were no more. IMO, they're dang good trucks for towing not real big loads, if you can find one.