Fleetwood Neon
A Fleetwood Neon might fill your needs. They are small and robust (as tent trailers go). Ours has 6'4"+ standing head room throughout the 7' x 5' cabin, a 6'9" x 54" comfortable bed, room for 4 adults and a dog to sit around when it is cold, large vinyl windows, a real door, a propane furnace, interior lighting, 1000 watt inverter, solar and a 100 ah AGM battery while weighing about 1,000 pounds.
The stock wheels are small (10") so most folks go to 14 or 15" with a spring over conversion on the axle to get better ground clearance. If you do the spring over, don't flip the axle as that inverts the camber and will wear tires quickly. It's better to have spring perches welded to the top of the axle and then move the springs up.
Unfortunately, Fleetwood Neons were last built in 2006 or 2007, so you'll have to find a used one.
Full disclosure - ours might be for sale soon as we're contemplating a new 4x4 expedition truck!
Howard L. Snell