For the weight police, those srw trucks that you see with over 4000lb payload capacities (plenty of them that have 4300-400lb maybe a bit more), is kind of misleading when talking loads that pretty much only load the rear axle like a truck camper.
All HD srw trucks are 3000-3500lbs empty rear axle weight. "Payload" in the truck cab is roughly split between the f and r axles. Camper puts 100% or nearly 100% on the rear axle.
So, if you're counting calories on your truck and you have 500lbs in the cab, that's say 250 on the rear and 4000lbs of camper, that could be ALL on the rear. Now you're, best case 7250lbs on the rear axle and most of the tires and wheels have their own rating in the 3500/3600lb range!
Tricky? If you're worried about it, that's why so many recommend going straight to a dually. Even with the best intentions, it's easy to bust out of the "numbers" on a srw truck.
On the flipside, there's been and continues to be 10s of millions of trucks running around daily, for years "busted" out of the "numbers" without any ill effects.
Depends how far you push it.