I would bypass camper and go straight to T.V. with cable wire. Just to be sure you are getting signal. If that works using continuity(sp?) tester go from connection to connection to locate problem area.
2016 Ford F250 XLT 4X4 6.2L
2015 Rockwood Signature Ultralite 8329SS
Nights camping in 2016: 19 nights
Miles traveled in 2016: 2,575