The single seat Daihatsu Trek was a peculiar concept vehicle
from 1990 which had a trick up its sleeve.
The Daihatsu Trek has the ability to take its sole occupant
out to a remote area - assisted by its off-road wheels
and front winch - and once there the steering wheel, seat,
and roll-over bar fold away leaving a flat deck on which
to sleep. To provide cover from the elements, a few minutes
work erects a cover over the deck under which to relax.
Basically it was a drivable bed with a tent on top. Thankfully
the Daihatsu Trek never got further than the concept stage.