I need to source an 80 to 100 amp hour deep cycle battery upon my arrival at OSH. I'm camping this year and need the battery to power my CPAP at night. I'm carrying 20 lbs of solar charging equipment in my Mooney, but don't have any additional payload to lug a 66 lb battery 1400nm. Any leads on borrowing/renting/buying a suitable marine/tractor battery (new/used; inside or outside the fence) appreciated.