Do you keep your battery topped up and disconnected from the TT when the TT is not in use? If not, chances are your battery is getting depleted within a couple of weeks then it sits without a charge for ??? amount of time...this is not good for the battery life.
I also went ahead and changed all lights in the TT to LED so my evening draw is lessened.
I have two 12V batteries with a ground disconnect in the event my TT sits without use. When I winterize the TT, I pull both batteries out and have them on a charger to keep them topped off which I understand as very good, long term maintenance.
Just some ideas to help with dry camping.
EDIT: some good info provided in the post which precedes mine.