I installed the following in my 865:
Panasonic 24" LED
VideoSecu ML10B Flat Panel Swing Arm Mount (max 33lbs)
I had to drill 1 hole thru the 2 sheets of plywood wall and to do that I had to remove the Jensen entertainment unit, no biggie. I wrap it in velco and surround it with pillows to secure it during travel. It's a bit wide but it's our bedroom TV so I didn't have to buy one. It works good. The antenna/lna in the Lance picks up more stations than the 8' directional antenna in the attic!
We don't watch much TV while camping, mostly at night before bed and to get local weather.
Good luck.
Rick
2015 F350 Lariat CC PSD 4x4 SRW
2015 Lance 865 Truck Camper