I currently run a 98 Ram 1500 with the 318 and auto. I don't have the towing package which means I only have the standard trans. cooler. I pull a trailer with about 3500 lbs total weight. I figure a cooler couldn't hurt, but which kind (Landscapers Supply has one for about $100) to get and can I put it on? A guy I know told me that its like a hydro system on a mower and you can't let any air bubbles get in it when installing it which I think would be near impossible. Anyways any advice would be appreciated.