First... you mentioned in the title, on storage door... I truly hope your not trying to mount the TV on the storage door, but a panel inside the storage compartment... I've never seen a storage door suitable for that kind of weight except for maybe a commercial bus chassis where the doors are designed to be opened and closed many times a day and take a beating...
I think that I'd just start from scratch and buy a good one... I have mine on a wall mount but also put a stand under the tv with a cushion when we're running down the road... I've never personally felt that the quality of the tv mount was designed for a tv that can bounce with each dip/hole/rut in the road
Retired Business Owner, Re-manufacturing HD Clutches, Brake Shoes, Air Compressors, Sales & Installation of PacBrake and other Industrial Friction