I have a used 16' Lund Rebel I recently bought and am thinking about a transom electric trolling motor for it. The boat listed weight is about 500 lbs. I'm thinking maybe a Minn Kota Edura c2 and then maybe down the road adding a Nav Pro. So I'm trying to deterermine: Will 40 lb thrust be enough to keep me moving along the weedbeds or keep my line straight down while jigging the river? What length shaft, 36" or 40"? Will this motor accomodate a Nav Pro? Thanks