Docsource,
I will be honest here (that is not atypical for me), but part of this is that I wouldn't trust Thor....
If you can, you should locate the converter/charger and come back here with a make and model. Then we can answer your question.
I live in SE Michigan (now, a refugee from the east coast magopolis) and the winters here are a lot like Seekonk. I have never take any of the batteries out in 14 winters. I don't replace them very often either.
If it is not a problem to lift the house bank in and out, you may not have enough. We have a 23' classic with LED, and even when the reefer was gas, we were often short of house power.
Matt
