Mike,
I think I’ve seen your posts on Walleye Central. How much vertical space do you have in your battery compartments? You need 11 1/8” clearance for the Trojan 1275s. Two of these would definitely increase the reserve capacity of your system, extending troll time on your rig. Each Trojan is 23lbs heavier than the group 31s I typically use.
If you’re got a solid 24v Terrova and have money burning a hole in your pocket, I’d spend it on a Panther lift bracket and kicker versus upgrading to a 36v Terrova and three batteries, wiring and charger. If you’re a hardcore troller, that’s the only way I’d go if you wanted to invest that kind of money in your rig. I would have added a 9.9 kicker if I had a usable electric steer bow mount TM on this boat- but I didn’t.