Ok, in the thread about BP magazine not including Clark's in their reviews, a topic came out about a one tree hammock stand for places with not enough trees available. Link to thread if anyone cares:
Here is some of the thread:
Everyone has probably seen a truck bed extender, or a canoe carrier that attaches to your hitch. They are basically tubular steel welded into a "T" that attaches either into your hitch receiver or over your hitch. Why not modify something like that for car camping? Tubular Aluminum or steel, put together with hitch pins that you could break down and carry in your trunk or truck bed when not in use, and then pin together when you needed a place to hang?
It would take some experimenting with stability, but I would think it would be doable. If you had the ability to hang in your hammock anywhere, anytime by pulling over to the side of the road and putting a few pins together, wouldn't that be preferable to sleeping in your car, or in your in-laws crappy spare room / living room?
Does anyone out there weld?