Hello all, I am new to the 5er (as I have read they are called) crowd. Years back had a TT that we traveled the midwest in and showed dogs out of. Well the dog showing days are over and we have bo8ught a used 28' Sunnybrook. We have been out once 2 weeks ago without incident and plan to go July 4 weekend. My question is about towing a trailer behind the 5er with a motorcycle on it. the Sunnybrook has a hitch on the back but havnt found wiring yet. What kind of tounge wieght can you safely use. This hitch apprears to be factory or close to it is welded to frame and then bolted to the bumper. Is there a Sunnybrook factory option list that may have info on this hitch?