Be careful putting the weight of 3 lead acid batteries and a trolling motor in the bow of that rig. It will affect the bow lift/ride. This hull design was constructed 20+ years ago, and these trolling motor options weren't "a thing." If you want to go 36v to take advantage of the run time and thrust I'd suggest going with 1 36v Lithium, or 2 in parallel, to run a 36v trolling motor. I also have 24v lithium options as well to keep weight down. Lithium batteries aren't cheap, but they have a longer life expectancy, and offer better power throughout the a charge.