I have four 6v GC batteries good for 470ah gross, meaning 235ah net using the 50% usage rule. I use all my trailers 12v powered devices(including the furnace) and I'm never wanting for power. Mine are on the tongue using a DeeZee ATV tool box that I vented. If I was led to install them in the coach I'd be real careful to build an enclosure that was completely sealed from the rest of the interior environment but well ventilated to the outside,,,,I think an interior mounting set up is doable, but would need to be well thought out.