It was on some sort of spring loaded mechanism and came down almost to the top of the front seats.
Rv drop down bed mechanism.
This design by brian rogers uses lift supports to raise and lower the bed from the ceiling.
The nearly silent bed lift system is operated by a single motor that controls four support mounts to raise and lower the bed at 2 3 inches per second.
If you scour youtube there are a number of people who have designed custom drop down bed systems.
Powerful heavy duty bed lift solutions.
If construction is not your thing don t be discouraged.
Back in the mid 80s winnebago made some class a rigs with a pull down double bed over the driver and passenger front seats.
These are a hybrid design between a platform bed and a convertible one.
I bought a couple of them for a summer travel program to haul kids.