If you scour youtube there are a number of people who have designed custom drop down bed systems.
Rv drop down bed mechanism.
This design by brian rogers uses lift supports to raise and lower the bed from the ceiling.
Powerful heavy duty bed lift solutions.
It was on some sort of spring loaded mechanism and came down almost to the top of the front seats.
For years happijac brand by lippert components has been an industry leader in rv interior space management.
If construction is not your thing don t be discouraged.
The happijac power bed lift is easy to operate and perfect to maximize space in toy hauler garages by lifting beds out of the way to make room for motorcycles or atvs.
The straps retract into the bed base concealing the lifting system while in the retracted position allowing oems more freedom in floorplan designs.
These are a hybrid design between a platform bed and a convertible one.