I believe to 'lower' the upper bunk, you LIFT the bunk up enough to then turn the 'hinges' out of the way, then lower the bunk...
as for the bunk doors - if you're using the area as a closet, then I can maybe see the need for doors to 'close' the area off... but...
if you're using it as a bunk house, as originally intended, then door tend to just get in the way - the weight of the doors also can present a problem since the hinges need to support all the weight only at the bottom of the door - not side hinges as most doors have.
The best move we ever made was to remove the doors. We don't need um.
two Campers, two Electric cars
former diesel pusher traveler