Our 2004 jayflight has a "small" cubby hole in the overhead cabinets at head level near the back of the trailer (above the dinette, and next to the entertainment center/DVD player cabinet). No door... and inside the cubby hole is the cigarette lighter-style wall plate and the cable connection with the antenna amplifier button (not very convenient!)... The "cubby hole" was obviously meant for a very small DC television. I purchased a 22" 12VDC LED flat screen tv and a VESA articulating wall mount that I mounted to the cabinet frame (after reinforcing) near the cubby hole. Works great. Now I use the cubby hole for all the electronics (wires, inverter, etc).
I'd start by looking in all the overhead cabinets for your wall plate, near your entertainment center.
2004 Jay Flight 21FB
2001 Yukon SLT