I'd top off the tank and add a conditioner. I used to live in the east, and have a Miata that I would store for the winter - 4 to 5 months in PA. I topped off the tank and added a stabalizer. I disconnected the battery the first couple of years, but that was a pain because I would have to reset all the electronics, then I got a tender, it worked fantastic. Even when the power failed it came back on without a problem. I had a friend who was worried about leaving his battery on the tender without someone to check it every so often while he was gone, he put a timer on it and that way it was on a few hours a day max. Since the tender has a built in controller, that was a little overkill.
Here in the SW, I now have a low-watt solar panel with a charge controller that I regularly connect whichever vehicle I am not using a lot. Got the stuff from an RV place. I installed a 2-conductor plug onto my battery that stays there all the time, and I made a plug-in panel that I mounted in the face of my workbench. Power comes off the solar panel into the garage and connects to the charge controller. I have 4 places to plug into on the panel using 2-pin 12 volt outlets. I made a jumper cable out of coiled 2-conductor wire to plug into the panel and the battery cable. I also put an electrical outlet on the panel so I had power for a block heater or whatever. So, I can charge the car/truck batteries, and also some of my other 12 volt stuff.
Sorry if this got a little long, but there might be others who would like my idea and could put it to good use. The initial cost of all this stuff was not that much, and by now it has more than paid for itself, the sun's energy is free. By the way, I have a small solar panel that I carry in each vehicle just in case a battery has a problem and needs remote charging. I also have a solar panel/with charge controller on my horse trailer that keeps up it's battery. The nice part is that the sun charges everything all the time and you don't need to connect the +12v through your trailer plug anymore.
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