Originally Posted by Flybob
Unless you add aux charging equipment, Your TV will not supply sufficient power to keep the battery charged while driving with the tank heaters on. Main reason is the 12V aux wire in the TV harness is not large enough.
That is very good point. I'm not sure how many amps that wire would be able to carry, what I do know is those tank heaters pull a lot of amps. Might work if your tanks where up to temp 60 degrees already. By any chance would anyone know what amps your TV puts out to the trailer?....