I've done a couple hours of research and think I'm more confused than when I started. My tourney partner just got his 1860 Tracker Sportsman that's all rigged from the get go. As I was looking things over I noticed it's got the 7 Seelites, Honda genny, 2 batteries, but an onboard charger. It's a Noco gen2 2 bank charger, but correct me if I'm wrong but between a 55# tm and 7-50 watters, them batteries aint gonna last long, and an onboard charger isn't meant for charging while you're running. So I believe a 55 (iota or powermax) will do, or does he need to step up to a 75? Thanks for the help fellas.