Hi guys.... What thickness wire do I need to run a 55# TM from my battery, which is about 15' away in the bow? Will 8 ga work as well as 6 ga? Do I really need "marine" grade? It will run under the floor of my Riverhawk. Also, what kind of battery charger is best to optimize capacity when recharging. My battery is Costco Marine Deep Cycle, 27. I currently have the Schumacher charger with 2 AMP and 10 AMP settings and deep cycle switch but battery draws down pretty quickly. Thanks in advance.