cookie,
Does your '01 have the camper package? This includes a rear anti sway bar and one or two upper secondaries (over loads) above the rr spring pack. I can only recommend the smallest hard side camper for your rig without a lot of fiddling with the rear suspension to take the load. I have a friend who did what you are contemplating and he was always complaining about the poor mileage (6-9) with the camper on pulling a small trailer.
The biggest woe with your truck will be the transmission. This era Mopar trans does not have a good track record. What's the end point? 60K miles if driven without a load. The other thing is the rear end is marginal at best ( too high a gear ratio and small parts) with a lot of weight in the bed. It can be done. If you live on the flat and are not in a hurry, your truck with some fixes (E rated tires; susp. help, extra cooling for the trans) and a small, lightweight camper should be fine. Which? I like the Lance 815 and 825 as they are light and narrow and have a small footprint. Oh, and forget about a basement type camper as that adds a lot of height, width and weight; more than the ability of your 2 series Dodge can handle.
Basically, I'm recommending what we did lo those 14 years ago with a used, small Lance only on a much more robust 2001 Dodge truck. So far so good.
Expand your search out at least 1K miles and be prepared to drive a ways to inspect prospectives especially if buying used. God luck in your quest.
jefe