Back trolling has its benefits in some areas. Heck, on a good day in the Detroit river, it is better to back troll as you get better boat control.

The 5 battery setup is usually 3 for the tm, 1 for starting, and a secondary for a kicker OR, to operate electronics. It is needed when running the Verado and a kicker attached to the main steering. Mainly because they run electronic steering.

4 bank is the max at one time. I have not checked on a 5 bank but, if you are only relying on the starting battery to start the boat and all electronics are running off rear bat 2, then the alternator would be sufficient for the battery not connected to the bank.

Too many guys rely on the alternator to charge their main but, don't realize that everything but the trolling motor is tied to it. Even had a boat dealer tell me you don't have to charge the main battery. After giving him this scenario, he changed his tune.

You run out 5 minutes with nav lights, you run your livewells, vhf, 3 fish finders, and stereo all day long. You head back in 5 minutes. Was it enough time to charge the battery? Do you trust it tomorrow when you do the same thing?