I just put one (Dometic) in my 74 Argosy. This is the greatest thing ever! Not only does it detect which power souce available is the best to use, it will also ignite the gas without having to click on anything. It's like magic! I run some heavy gauge wire to the batery block, put in an inline fuse, and I'm ready to roll. I added a second battery to the unit, ran it on DC during the 4 hour tow, had it on propane for 3 days, along with the hot water heater and cooking. Used a small tank (BBQ size) of lp gas up over the 3 days, but didn't notice a dip in the electric charge.