Im assuming you're employed but live in S. Cal. Some of my suggestions assume that.
Thoughts:
- You really need a cigarette lighter mini fridge. They're less than $100 at home depot. Note, they suck, but you don't have alternatives and you'll be able to have a cold beer occasionally.
Careful not to drain the car battery, and keep it in a shaded part of your vehicle.
- I find that there can large T differences in the car. Under the seat is fairly cool, and the T is more stable.
Keep your meds and the mini-fridge there, preferably by the floor vent if equipped.
- Does your van have windows or is it a workman's van? Glass is your enemy. You probably cant afford to just buy a van, but a white windowless Transit van is better than a Pacifica.
- Use white bed sheets to cover your interior and shade everything.
- you probably do this, but solar windshield covers.
- Keep your windows open a crack. Really just a crack small enough to keep even the rain out. Convection is huge. This is most important at day if crime is locally a problem.
- Paint it white.
- If you can, take advantage of the van's mobility and move to fairer weather throughout the year. If you have to stay in the LA region, go north just across the mesa (?) towards S. Barbara. Much cooler there. Id set myself up in Montecito myself.