Forget about Chevy 1500 & 2500 series for truck campers now

That's nothing new at all. My 1986 GMC one-ton dually has a 2400 pound payload sticker in its glovebox!
Its been carrying a lot more than that, with zero modifications, for 30 years and has yet to break. Thats why I still have it!

If I had a brand new Chevy 2500 I wouldn't be concerned about that. Maybe in Canadia they weigh pickups and hold them to their door-sticker weight but they don't do that around here. Stay within what your tires are rated for and you'll be fine.