We are taking a cruise from Sept. 1-8, leaving out of Port Canaveral, FL. We have arranged to park our RV and toad in a lot in Cape Canaveral. Will the batteries last for 8 days running the fridge on propane? A good friend of ours(also a full-timer) says no. If this is true, we will have to empty the entire fridge/freezer before Sept. 1st. We'd love to hear from anyone who has experienced this same scenario. THANKS!!