Lone wolf, since your trailer is a 99, it should have rg6. what are the wall plates like? In the campers I have setup satellite service for my customers, the problem was usually the wallplate that the cable comes out of, they normally have a splitter behind them, or build on and sometimes have a little circuit board on them for your off air antenna, they do make what is called a flat cable, it's white and thin with connectors on the ends, you close it in the window, and connect the cable from the satellite and to your reciever and no re-wiring needed, however, you have to use the high frequency type with the blue center conductor, hope this helped