One of the reasons i traded to up to a 2500hd truck recently is that my wife and I are looking at New campers in the 7500lb GVWR range..
Would my 15 Chevy Silverado 1500 have pulled it ok? I think it could have, but i know i Would have been right up against it's limits.
It towed the rig in my signature very well, but when loaded heavy for a week camping trip, with my family of 4 in the truck, it felt heavy and based on the way it felt, I'm sure i was close to my payload limit.
Just not enough margin for me personally. Now that i have this 2500hd, unless i can't afford it, i will always have a 2500hd truck. Trading up to this truck was the best thing i could have done
It's great.