Our 5er came with a 1 1/4 in receiver hitch bolted on the rear to the frame. I used it on one trip this summer to carry our two bikes. What a mistake, the bikes bounced so much it damaged the back of the camper. I tried ever thing to try to control it from bouncing. I am now in the process of getting that hitch removed and have a heavier 2 in receiver installed. On our last 5er I had a 2 in receiver welded to the frame and I towed a boat with no bounce or problems. If you are going to mount a hitch make sure it is to the frame not the bumper
and have it done by a hitch shop. One last thing, remember why all kids want to ride in the back of the bus on a bumpy road.