I never worry..... point out the camper and I will pull it! Always better to have too much then not enough truck.... Now I know most would not buy what I have but I was making a point here. Always have a little extra and travel is easy.
MY 2006 is doing fine with the tires that came on it, check tire pressure, cover the tires when not in use, treat the tires with a good tire care product. Most of all rotate the tires... My tires are doing great and I pull some weight in the toy hauler, 200 gal of fresh water and 70 gal of gas with two road bikes.