I asked one of the mechanics at my BPS Tracker shop the best route to run the wiring and he said to pull the floor(just held down by screws) for a clean install. Where the front battery is located it is a PITA to pull it and check the water. If you look behind the battery, there is a opening that lets you run the wires under the live well back to the charger under the floor. That's my plan of attack. If I can't find a combo charger, I will be adding a MinnKota alternator charger that will charge the trolling motor battery when the big motor is running. What engine are you running on your rig? Are you running the stock trolling motor on the front?