I have a 1997 Chevy Silverado 1500 that I'm about to replace the tires on. I'm replacing Kuhmo Ecsta that the previous owner had on it. I'm looking to put on some on/off road all terrain tires. Was mostly looking at Cooper tires, possibly the AT3 or the AT3 copies sold at pep boys, discount tire, or NTB. The copies have a standard load or passenger rating but the AT3's have a XL or C rating. My question: Is the XL or C rating necessary for what I need, or can I get away with the standard loan rating for the tires? I only use this truck to tow my boat and the occasional trip to lowes. The reason I was looking at all terrain tires is because this last weekend i got stuck a couple times on a dirt road, and also just backing up my boat on flat grass a couple times. The current tires aren't bald but they barely passed inspection. I only drive this truck about 2,000 miles a year, so I'm not looking to spend a whole lot on tires. I am open to looking at other brands, just heard a lot of good things about cooper tires. The factory size is 235/75/15.