My 77
scamp has no
battery or provision for one but the stock 7pin trailer plug allowed running the 12 volt
lights at the end of the cabinets that Eddie mentions off of the tow (typically wired to an accessory circut). Or the
fridge could run off of 12 volt going down the road (bad idea to run
fridge when not level but you could)
I too noticed the outlet where most I have seen would have an AC
light.