So, my future in laws may be giving me their popup camper for free. It's going to be in rough condition as they haven't opened it in many years, but me and my friends are going to make it a project and do a complete overhaul of it. My future in laws live about 400 miles away, so I'm going to need to drive out there and pick it up and tow it back to my place. My Jeep doesn't have the factory tow package on it, no lift kit, and I'm running tires of 245/70/16. From what I've read, the KJ's max tow capacity is about 3,500 pounds without the tow package, and the popup is less than 3,500 pounds. I'll also be driving the trailer up and down plenty of hills and mountains, so I want to make sure I don't cook or overheat my engine or transmission. Should I be worried about overheating the engine or transmission while towing? Would the upgraded PML transmission pan and the heavy duty engine cooling fan be worthwhile upgrades for this?