Those who have a solar panel that sees enough of the sun in the winter, I would think, would not need to charge the battery. Those who keep the camper on the truck and drive the truck fairly often (this would probably include me) should also be OK. I am sure that many owners hit the master 12 volt power switch if they were not going to use the camper for an extended period of time. In my Hawk, this would disconnect everything including(?) the Propane / Carbon Monoxide sensor, which draws about 40 milliamps and could drain your battery during the winter months. I also added the remote control option to my fan, which also draws about 50 milliamps.
I still monitor my FWC battery voltage often.
Steve