Missoula, MT has a small storage area almost exactly 1 mile from the front door of the airport. It's around $50 per month for a small unit. You pull in, drape your wet tent over the bike, pack a small carry on bag with all your dirty laundry, and start hoofing. 20 minutes later, you walk in the front door of the airport.
I would opt for the smaller airports for this kind of operation. If you use the bigger airports, pick a spot further away from the airport and take a cab.
The battery voltage was almost unchanged after 5 weeks on my AGM battery. The bike fired right up, I packed up the now dry tent, and was on the road in 30 minutes.