[Piotrsko]

Might I suggest a Burro, Casita, or Scamp? All about 11 to 17 ft long, burros being about 1100lbs and Casitas being 2000 ish. My casita improves my trucks mileage by a couple of mpg on the long hitch. IIRC, you're tallish, so all of these require to scrunch up a bit in the sleeping configuration unless you mod it for the tall person.
You can score a burro or scamp for a couple hundred, sometimes

The pointy roof popups don't have much headroom except in the center, they really need a gable over the bed, have seen them with a gable over the toilet, which I think is mandatory

Neighbor across the street aquired a hard sided popup since he likes camping(?) In bear country and the rangers won't allow tents.