I wouldn't personally use a trickle charger. I use these full-featured Deltran chargers on everything to keep all my equipment batteries in shape. They don't constantly charge the way a trickle charger does. They actually monitor battery state and charge as needed. I leave them connected to my tractors, boat, idle cars, and generator all year long.
Amazon.com: Battery Tender 022-0150-DL-WH Waterproof 800 Battery Charger: Automotive
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It's always amazing how free shiping is always 2 or $3 more than the price of the item you want .