I am new to the towing scene tent camper for last 35 years! I have a 2003 Expedition with a brake controller and a 2003 Explorer without! I have going to buy a 1993 Colemen, Pioneer Seneca XL Saturday in Dekalb IL. I am in St. Louis! What will I need to tow this back home with the explorer or the expedition. If possible would like to use the explorer to save on gas! The whole brake thing has me confused and what size drop will I need to buy for both vehicles they both have a factory 2" receiver hitch?