I installed a Dual Pro SE batt. charger on my Gulfstream. It runs everything on the boat, I don't have AC/heat, and keeps my batteries charged. I can run the livewell all night and have fresh batteries in the morning. I fabricated a pigtail adapter so I can plug a standard extention cord into it and then into a 30 amp. shore power recepticle. It works great.
Just find a convenient location for the charger near the batteries and mount it with the supplied hardware. Connect the leads to the batteries and plug an extension cord into the short male cord on the charger and you're in business.