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If you're into a lot of heavy electrical use, or you're just willing to spend the money, dual Optima dry cells...they don't come cheap though, about $130 a pop.
I just went down and bought 2 of Wally's best @ $67 each, haven't had any problems going on 2+ years, if I do have any problems now, they are more than paid for.
I plow snow and have an electric over hydraulic dump bed.
I get the best service out of deep cycle marine batteries, Interstate Megatron Deep Cycle, the biggest ones they had.