Don't get hung up on trying to figure out what addons to put on your truck BEFORE you have loaded and hauled the camper at least once. None of the modern 2500 or 3500 trucks made in the last 20+ years will collapse or tip over under the weight of that camper, even if it's 3000lbs. Load it. See how it looks. Drive it. See how it handles. THEN figure out how to spend your money, if you need to spend any at all.
Factors like excessively old tires, excessively high mileage (and the resulting fatigue of hard parts) notwithstanding here, of course. Expecting 10-12 year old tires to handle their full factory rating at speed on the highway is rolling the dice, for example.
