Get one of those hotel wall mounts. Best Buy has them. Anchor it inside the cabinet and just push the TV against the cabinet frame when traveling. A little velcro will hold it there. Don't be surprised if the mount costs more than the TV.
I got rid of my overhead headbanger TV and put it into a cabinet behind the pax seat with a televator across from the couch. Used the wood from the lamp table that was there to rebuild the corner cabinet. This way you don't have to crane your neck to watch TV.
What I started with...
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What I ended with...
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