I remember seeing a nifty jump box on a tool truck years ago that had not only the big jumper cables, and of course the the little spotlight, but it also had a little cord reel in the back that would unwind a set of POWERED test leads for doing thngs like powering a blower motor, or window motor, or whatever you wanted to put 12V to. I think that would be really handy to have but can't seem to find anything like it anywhere. I should have bought it right then and there. Anyone seen anythng like this?