I thought about just using a Webasto off one of our buses, but I think it would kind of be like taking a machine gun to a fist fight. I think it would suck too much juice anyways for my batteries unless I added two bus batteries and then I'd have to run it on 24 volt instead of 12. I don't know, I think for now I'd rather just buy one for my truck then getting a huge one out of our buses. What brand of buses you say? Well, the big wig owner will pretty much buy and brand as long as it's cheap enough. We have MCI, Setra, Vanhool and Prevost. I also get the joy and privilege of working on old Thomas and Bluebird school buses.