I think you might be over your head with the multimeter. Just make sure everything works. I can usually get a sense from a seller if he's being honest or not, and sometimes you just have to take a chance. I would ask why such low mileage because as I mentioned, some of the Dodge's handling issues kept owners from using them a lot.
Driving it is very important, and at highway speeds.
It might be worth paying to have an RV mechanic check it out. I think this might depend on how you feel about the seller.
Ask more questions here if you feel the need. Don't forget to read the "FAQ's" Sticky at the top of the first page. Lots of good buying advice there.
Good luck.