That comes as little surprise to me. My '84 1/2 ton 2wd longbed was REGULARLY loaded with over 3 tons of tree stumps and logs, with the only suspension aid being a set of coilover shocks adding 1000 lbs capacity. It was only a problem on two occasions, once when we were pulling the logs out and all 4 of us forgot to remove the tailgate, and a 79" diameter stump flipped up and came down on the tailgate, absolutely destroying it...and the other time was with well over 6000 lbs in the bed, the truck got high centered on the hitch as we were pulling into the brush site.