Ideas are finally taking shape!

 A couple of important restrictions/requirements.

1. Garage height: 2.7m (2.55m at the door)

2. Garage length, max ~7.5m

3. Must be able to carry 2 adults and 2 dogs or 4 adults in a pinch.

4. Must not have a 'tilting cab'.

5. Toilet and shower must be of 'normal size'.

6. Ideally, a washing machine/dryer combo should fit.

Found it:

Stats: 

1113B Mercedes Benz Kurzhauber, 4x4 with locking middle and rear diff. 4.2m wheelbase.

7.1m long, 2.5m high and ~2.5m wide.

With a shortening of the cab, it should be possible to have a 13ft (4m) box. Examples of the layout here (from Bliss Mobil) The bed raises up. To be able to fit in the garage, you would need a raising top

Modifications:

1. Remove pump from front bumper and replace by a winch, should save ~30cm in length? Maybe even more

2. Shorten cab by ~1m to create more space for the box.

3. Convert to 'singles' tires (https://rundhauber.eu/wielen-en-banden/ , https://rundhauber.eu/banden-4-de-finale/). Could be difficult, as the rundhauber has rims with 8 holes, rather than the more usual 10 holes at Mercedes. Would like 'sprengringfelgen' to enable easy removal of tires from wheels. Also the hutchinson runflat would be very cool: https://vrakking-tires.com/20-inch/913-1000vx20-jamak-wheel-8-holes-et-90.html and https://vrakking-tires.com/run-flat-protection/528-run-flat-system-3-pieces-hutchinson.html with beadlock protection https://vrakking-tires.com/run-flat-protection/621-711-beadlock-tire-protection.html#/21-quality-new (enabling you to run lower pressures, down to 0 bar?)