Okay, I'm still in the planning phase for a complete tear down and rebuild of a gifted PUP ('85 Palomino Pony) and am thinking about electric. I'm an avid DIYer in construction and have a bunch of Dewalt 20v portable tools and 5AH battery packs. Our camper isn't going to have anything that needs 120v and I don't think that I'm even going to install that option and as such, everything inside will run on 12v (LED lighting, maybe a 12v pump for the little sink and a ceiling vent fan). My thought is, if it's possible, to use my tool batteries as a power source, but I can't find anything online that would be of any help. Any thoughts?