I live out of my uhaul van. I am putting to gether a system for watching satalite tv and dvd's with a mild audio set up. I will be useing a bank of batteries to power the system while the veheicle is parked at night my questions have to do with charging the battery bank. I am thinking of useing a series of 4-5 ho hydrolic alternators to charg the bank of batteries back up. I have seen pictures of thes hydrolic alternators in magizines but I cant seem to find outfits that are selling them. can anyone tell me where I can find these things ? thx.