Sillybugs2 wrote:
Get a charger and bring battery home to fully charge. Hook it back up the day before you leave and turn fridge on propane. We store our batteries in the garage between trips and if a long time between charge them up while they are in the garage.
That is exactly what I do as well.
OP, get a good charger
(link to read up on battery chargers). Don't forget to bring the batteries with you and re-install them before towing as your brake's break-away circuit requires the battery to work.