you need to find out what axle you have. belive it or not, older campers are very heavy too- no newfangled lite-weight materials...brakes are going to be a concern. you will want to be able to do a reasonably decent emergency stop, because it will eventually happen.
my '89 8 foot TravelMate is an old school "lite-weight" and it comes in at 750 kgs (around 1700lbs) empty and dry with nothing in it. throw in propane, food, water, and around 800 lbs of stuff for 3 people and dogs (dont forget the weight of the dogs too!) and then add a few more for toys and stuff-fishing gear or motors, jerry cans, bikes or whatever. by the time we head out, our "lite-weight" is usually around 3000lbs or so....
belive me, no matter how careful you load, can almost guarentee you will always be way heavier than you think....
you will want to be able to stop that weight...
if your susp sags, run some airbags, there cheap and easy to install and will help quite a bit. i have a 1 ton, but still run bags for the control it gives me.
go easy on the corners, go a little slower and these old trucks can do it