Need some immediate help - will my truck carry camper

Camper guys are kinda of chicken-little sky-is-falling sometimes.
Where I work, I see guys loading 4000 pounds into half-tons, OLD half tons that have been doing it for years. I see loads of stone and cement go into 3/4 and one tons that - from what I read on here - should make the truck fall apart in the first mile.
But they come back again and again, no problem.

In other walks of life, these same trucks work SO much harder and no one bats an eye.