Was considering adding a second trolling battery in parallel for this summer. I am planning to try pulling cranks. In theory, this should double my endurance, correct? Other question regards my charger. I currently have a 2 bank charger wired to a single cranking battery and a single tm battery. If I have a pair of batteries in parallel, and they are wired to tm only, can this still be considered a single "bank", or do I need to also upgrade to a triple bank charger for this setup? ORRRRRR..... am I just making things complicated, and should stick to what I have?