Plan on buying a new boat with the intentions of keeping both trolling motor batteries under the front deck. I'm wanting to mount an onboard charger near them as well but my dilemma lies in also charging my depth finder battery which is a smaller 12v like in a deer feeder. I typically add and remove my tm batteries and depth finder rig 2-3 times a week during duck season but leave it all on permanently February-October. Will a typical 3 bank on board charger do the job? Or do I only need 2 banks if the tm batteries are wired together? This is my first experience with a 24v or on board charger I typically just place my trolling motor battery on front deck and use alligator clips. Thanks