Electrical Question-Breaker panel does not cut all power

if your trailer has a stereo system (and what trailer doesn't?) they are famous for drawing way to much current in the "off" position which is really "standby" resulting in a dead battery in a few days.

that along with things like a CO or propane detector hooked to 12V along with TV antenna booster= quick dead battery in storage.

Solution is to either use the built in battery disconnect switch or if one is not in the trailer ADD a battery disconnect switch. Hint.... leave the power jack connected to the battery.