The most economical way to go for longer battery life is by using two flooded cell 6 v golf cart batteries wired in series. Cost is <$100 each and the converter and the towing vehicle's alternator will charge them just fine.
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Marshall
2012 Laredo 303 TG
2010 F250 LT Super Cab, long bed, 4X4, 6.4 Turbo Diesel
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