I'm in the middle of building my CDN M101 trailer and I'm finally starting the electrical. While I don't have all of the accessories picked out, I'll eventually be putting in a dual battery system to run a fridge, a radio or two (music and CB) some small lights, etc. I'm not sure what it would be called, but I'm looking for something to manage the charging of the batteries. I'll have the 12-14V DC circuit coming from the tow vehicle (when it's running), a 110V AC circuit from the house or camp ground, and very likely a solar panel a little later. Anyone know of such a beast or combination of devices?