Should I leave my Travel trailer plugged in or not?

Both our HTT and now our TT are always plugged in. Many an evening spent in there enjoying a glass and some quiet time. Voltmeter is high on the priority list. We keep it plugged in to a very visible outlet and can always know if there is an electrical problem, either at home or at the CG. BTW, frig is always on and basic foods left from trip #1 until time to winterize....no hauling back and forth.