I carried a big 4500lbs camper on my 2500hd short bed duramax. I had super springs, ride rite air bags, big wig sway bar, 19.5's. CG was an inch behind the rear axle. It surprisingly handled it fine but you could feel the front steering while driving over bumps in the road a little squirrely from being an inch behind. Stopping power sucked. I left a lot of space between me and the car in front of me. Sold the TC for what I paid for it because it had a leak and bought a fifth wheel. I did not lose or gain a dime on it. I Still want another TC but I doubt I will go that heavy and I will make sure I don't go behind the rear axle either on the next one :B