THANKS for great info!
Guys, what I am doing now is pay a friend $20 per week to let me park my mini van in his spare parking space, use his shower, power, etc.. During hot days, I cover it with the cheapie variant of the Mylar Space blanket (no wind here). I live in my $900, 14 year old van, using a $30 per month, climate=controlled 5x5 ft storage space to hold stuff that I'm not immediately using, with a cat litter box for emergencies!
A wide mouthed jar handles liquid wastes. Often, a black garbage bag on the roof will heat up water enough for a sponge bath, and a kid's $5 inflatable pool will serve to catch the used water. A couple of 5 gallon water jugs see to it that water's handy, and a couple of "Life Straw" water filters mean that I can drink it.
I move twice per year, in order to mostly avoid the head and the cold. In the past, I have paid $120 per year for a "mining claim", upon which you have all the rights of an owner. BLM has over 1 million square miles of land west of the Mississippi, guys. One in the mountains for summer, one In the desert for the winter does away with most of your heat and cold issues.
You can rent a "tow-behind" little backhoe device, which uses your vehicle as the "counterweight". Near the top of a small hill, not on a flood plain, dig a slot large enough to accept your van. Scatter-hide the excavated dirt. Back your van or trailer into the slot, cover it with brush or a camo net. Use a mountain bike or small motorbike to get out to the main road, where you have another van parked (if town is too far to ride your bike) The van in the dirt-slot need not run, or even have a motor or tranny. In fact, having them removed makes the van much lighter, and not worth stealing.
Rent and mount a tow bar. You can pick up old mini-vans that don't run for $300, and get $75 or so for the trannie and motor. If you go into town, don't leave much of anything in your (hidden) van. When I did this (for 3 years) I tried to always come and go in the dark, and to brush out my tracks when near the van. Some people will tear up your stuff just to be doing it, valuable or not.