Hi folks...I think I have a 79 or 80. It has a full bath in the back..kitchen with oven, electric ignition furnace....enclosed bottom. Its a tan and brown color. Anyway, I have discovered some numbers stamped into the hitch and was wondering if any of you gurus could help me decode what I have. The first set of numbers is S80510222230179 then there is 64410200 which is followed by 2 5/16 for the ball size. Then there is 10-79 which I am assuming is the month/year. Ill try to get some pictures of it up here...its really in good shape considering how long it sat in the guys yard I got it from. Hope you can help