How heavy is your camper?
I carried a ton of gravel twice for a landscaping project. Went real slow for about 3 miles.
Campers are different. More weight/balance issues and wind resistance issues. My empty truck weighs 6000#, the loaded camper and truck is 7600#, 100# under the GVWR.
If my wife and dog come on a camping trip, we'd be overweight.
It seems to handle ok though.