What else does your truck do?

I’ve always thought part of the reason to have a truck camper is because you already have a truck anyway.
From reading here I’ve gotten the impression a lot of people buy a truck to do nothing but carry a camper.
Is that really common? Seems like a heck of an expensive way to have an RV!

Question Two is about the ol’ hot topic, payload rating numbers.
I understand trucks very thoroughly, it’s just a fundamental one; why is it that only camper hauling people are so concerned about payload sticker ratings, when it seems no one else is?
Here’s an example, one of my own pickups doing other work.
This is my Dodge dually with two 3000 pound sacks of 5/8-minus gravel in the back. On the scale the rear axle weighed right about 10,000 (that canopy is heavy too). That puts every tire below it’s rating and they’re only 235/85-16s. The Dana 80 axle has an 11,000 rating by Dana, In fact, F450 Fords used to use the very same Dana 60 front/Dana 80 rear combo. This truck has done this for 20 years. I pulled the rear hubs and bearings recently to have a look, they’re the originals and are in fine shape.
If you look at the so-called ratings for a ‘99 Dodge 3500, it says it can’t do this, yet it clearly can.
Where I work, one tons routinely haul this or more every day. I couid take lots of similar photos of others. Nobody using these trucks for work worries about it.