I checked into the specs on the Denalli versus the GMC & Chevy while we were at the All American Quarter Horse Convention at the OH State Fairgrounds lst week. The trucks are all rated the same according to the stickers on the windows. All CC long bed Duallys with D/Max are rated at Max 29,200 GVCWR. 22,000 lb gooseneck max trailer wieght and 17,000 lb max bumper pull trailer rating. I think the cargo/payload max wieght is 6790 lbs or something like that. I was told by the Wesern Hauler Sales Rep, that the 3500 GM trucks were rated higher than the F 450 Fords. I will do some research on that. We bought a Chevy 3500 and towed our trailer back to Maryland with it. Awsome truck.