I don't remember what Leeann mentioned. Its by Progressive Dynamics. They're here in Michigan... support the home team. The batteries are not paired. I 'think' the coach will supply a little voltage to charge the House when running, but definitely NOT the other way. I only say that, because once or twice when traveling long distances the house battery has seemed to have a little more oomph at our destination than it would otherwise... but we're talking HOURS here, so it can't be anything more than a drip... not even a trickle.
