On my 86 Gulfstream and 99 Travel Supreme 5th wheel. There was a box on the side with two flip lids on it. One was the cable connection and one was the phone jack. My 2000 Pace Arrow has the connection in the utility bay..
2015 Chevy 2500HD 4x4,2008 Crossroads Cruiser M29CK, 2008 HD Ultra Classic Trike