Here are two mounts I've used.
The tube type TV, 21 pounds, was stressing the fiberglass skin, even though I didn't travel with the TV up.
The first try had it hanging from under the rear cabinet. There were three "hooks". One orientation aimed the TV towards the side dinette, the other aimed it towards my pillow. LCDs, at least some, are sensitive to viewing angle and this system didn't offer enough adjustment.
The final approach used an over designed, over built, over the top RAM mount system. The mount has a stainless steel backing plate inside the cabinet. I made the plywood base that was the intermediate part between the TV and the lower mount. Works like a champ. I still don't travel with the TV mounted. The unit is an Audiovox D1210.
I've shown these before but I believe they were lost in the rebuild.