I run a 80lb Motor guide in a 16 foot Crestliner Sportsman, and it does good most of the time. I would absolutely go to 36V if I had more room for batteries. It’s very frustrating to not be able to fish where and how you want because the trolling motor isn’t strong enough. Running the big motor is an option if your trolling, but not while you’re casting or pitching. If you primarily fish the river get the biggest trolling motor you can afford and still fit the batteries.