One thing to keep in mind is if you don't have a battery disconnect, a charged battery will drain in a couple days with nothing on since their are thing that draw current all the time like the CO/propame detector, radio, etc.
In my case since I keep my camper at home I never worry about "when to unplug the trailer". During the camping season I plug in the trailer and turn on the refrigerator. That way during the camping season I don't bother unloading and repacking certain things each trip. I just keep things right in there like some drinks, frozen hot dogs and burgers, condiments, etc.
Food goes from my truck to the camper the day before a trip or so and never has to get carried into the house.
I just check the water level in the battery weekly. When I hook up to go camping I unplug the trailer and the fridge switches over to propane automatically and we head out.
We mostly camp at full hookup campgrounds though, so I don't worry about battery capacity.
Ray
