You can see that the two pairs are wired together. The closest black wire going from one pair to the other, and the red wire with the black tape joining the hot side. It's wired essentially the same as the diagram I posted earlier. Oh, you're not in the Hilton Head resort and marina are you? There's a rig here that looks like the picture of yours.
2014 Cedar Creek 36CKTS Explorer
Xantrex Freedom SW3012 inverter/charger
2009 Silverado 2500HD Duramax Crew Cab short box
Demco Glide Ride pin box
Demco Hijacker Autoslide 18K hitch