Good evening! Question: I have a 1999 Ram 1500, 318, auto 46RE transmission (with huge transmission cooler), and 3.55 gears. Truck STUGGLES pulling my 4,000 pound camper but I want to do more camping, mom really likes it. Should I up grade the rear gears to 3.91, 4.11, or 4.56? It has 245/75...