IMO, there is only one condition that “might” cause that type of tire wear while hauling a camper with your truck (independent front suspension). And that would be if your camper center of gravity was significantly aft of the rear axle, taking a considerable amount of weight off the front axle causing a bit of positive camber.
There is very little chance the camper was adding significant weight TO the FA. And if it did, it would cause a theoretical opposite camber and opposite wear that you’re seeing.
Your front tire wear is either due to misalignment, too much toe or somehow negative camber. Or the more likely cause is if you drove alot of miles on very twisty roads, the body roll of the camper will put more stress on the outsides of the tires than the inside.
In short, 99% chance it’s alignment or front end components causing it. 1% chance it’s the camper unless a lot of tight turning mountain miles I could foresee some wear.