I submit that this idea is a very narrow market. If you want a pre-made motorized mount, be ready to open your wallet - wide.
Like: FLP-310 Flip-Down In-Ceiling TV Lift
But if you are handy, you could make a manual version with heavy piano hinge and latches...maybe use a gas strut to aid in lowering. Add a bit of trim and a nice fabric back to make it look nice
Kim and Steve, Mustang LCDR (Ret), '07 Damon Outlaw #1193
I have seen gross intolerance shown in support of tolerance, Samuel Coleridge
WE LOVE OUR OUTLAW RV