the pup I'm looking at soon doesn't have a battery, I assume it just plugs in to shore power via a 110V receptacle on the outside like most small pups. I want to get a portable battery box and inverter to plug into the pup. I won't mount it to the tongue though. I'll just put it outside or under the pup while camping if there's enough clearance. My question is if anyone has constructed a battery box with an inverter inside it that's safe to leave outside. The inverter must stay dry, but also may need some ventilation. I will probably add a solar charge controller and a panel later. All the battery boxes I've seen are too small to house a battery and inverter. Maybe I should be looking at tool boxes that offer more room inside? Thanks.