I have a pro team 175 tracker bass boat with a 60 h.p. Motor. I am wanting to get a new trolling motor for river fishing. Right now i have a 12 vikt trolling motor and am going to install another battery for the trolling motor. I was wondering what everyone thought about how much thrust I should have 70 lbs or 80 lbs? Keep in mind i plan on doing river fishing so therefore i need a little bit bigger trolling motor to keep up on the river. Thanks