This is what I use:
Ctek 12V Multi US 7002 Battery Charger with Cigarette Lighter Adapter Optima AGM | eBay
In addition to aligator clamps and a lighter connector for charging, It comes with little cables with quick disconnects so you can wire your cars. You can order additional ones or extensions. It is great for garage queens, but can easily be disconnected and used for other cars. I have one for each 911 and keep them hooked up all the time when not driven, but routinely plug up my other cars in the winter and get them back up to full voltage.
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I use a battery maintainer for the garage queen and the pickup, since they only get used every couple of months.
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