We have a truck camper (slide in pickup camper) and typically camp in remote areas or national forests or national parks where there is no electrical hook-ups. This means, like many other campers, we depend on our gas-operated refrigerator to keep our food cold or frozen. Due to our age it is no longer comfortable to be climbing into the camper and especially out of bed at night, so we decided to get a conventional ball-hitch travel trailer. To our amazement the majority of new travel trailers we looked at were all 12v batter powered only, that relied on a...