I don't have this on my camper, but others have stated that the cable connection is a split off from the Roof Antenna/Cable Coax switch.
If so, you will not get the DVD to play outside since it is a composite signal off the player. (yellow plug)
Working on a system to get that signal (and others like the computer) outside. Stay tuned.
Lou and Laura with Bella - German Short Hair Pointer
2008 GMC Sierra 2500HD Crewcab SB Allison Duramax
2010 Flagstaff 8526RLWS - Superglide 3300
HAM CALLSIGN - KC3FFW