Have you looked at the GoStick TV mount?
GOstik Products Flat screen TV Suction Cup Mount | GoStik
I have this and have used it on the exterior fiberglass wall (under the awning area). I imagine it would work on my bunk room back wall anywhere that there is not a seam.
You'd have to test it to see if it will hold suction there. It will depend on the wall surface, it needs to be pretty smooth and non-porous. If you have windows in the bunk room it would most certainly stick to those with no issues as long as the piece of continuous glass is bigger than the suction cup.
These work on cars (same product is sold by another dealer for bike racks, I have one and love it, trust it with 2 $6K mountain bikes on it) and outdoor fiberglass walls, so it doesn't have to be glass smooth, just smooth enough not to leak air between the suction.
You simply take a damp rag, wipe the surface, then pump the suction cup to remove the air and make it stick.
I wouldn't leave the TV mounted during travel, but if it holds suction I would trust it just fine while parked.