In a previous entry, kiki commented on the following:
"How about building on of those small houses built on trailers? They can be done for much less than 20k, would be built to your specifications, can be permanent or moved, provide water, showering, toilet, kitchen, living and sleeping spaces. I think they are great."
Funny you should mention that because guess what I've been looking at? Actually, I've been staring at tiny houses for a while now. I've even gone so far as to meet up in one of those local tiny house enthusiast groups.
I mean, if I can't vandwell, I was thinking this would be my next step up as a possible option. There are also companies nearby that cater to exactly this sort of market.
As for cost, a good one that is pre-built is more like $40k, but that's still pretty affordable for a place to live.
Uhhhhhhh, I've also been looking into underground bunkers and storm shelters. That's a bit more specialized, but is fairly affordable as well....