Dusty, you can easily recover your investment in the ProSport, probably from someone on this forum who is in need.
Get an Intelli-Power 30 amp charger and a flushmount AC inlet that can be installed under the hatch next to the engine. This way all you have to do is fold back the cover and raise the hatch while standing on the trailer. You won't have to climb into the boat. The Intelli-Power 3-bank will function as a dual bank with two stereo batteries permanently wired in parallel or you can wire it as a 2-bank plus this charger has the ability to distribute its capacity based on the bank that is in need.

David
Earmark Marine