Chickadee, I hate to mess up your ideas ... but you need to do some research and a slight change of plans and ... hopefully you have a camera you can hook up straight to a PC for download ...

Here's the problem. Rat poop carries serious, life-threatening, birth-defect inducing diseases. Here's a short list https://www.cdc.gov/rodents/diseases/direct.html

When it comes to the papers, use your mask, photograph them and throw them out. :-( Yes I do know how painful that is.

Your clothing .. mix a container full of some hospital grade disinfectant and do a pre-wash before you start dragging them around to washing machines.

Your bedding and furniture cushions ... gracious ... I personally would take them out and burn anything that can't be completely immersed and soaked and dried.

Wipe down everything with that same disinfectant. Everything.

And then as far as the van's running condition goes ... I hope they didn't get to the electronics. If so, check with a mechanic, but it might be easier and less expensive to assume the worse and replace the wiring completely. Chasing down electrical shorts could consume the rest of your life.

While you're stripping everything out of your van, tent camp !! ;-)

It will be fascinating to see how you come through this adventure.

Have fun! Wait. Uh. Have fun, responsibly :-D