I have a 14' Jonnie with a 55lb Minkota for only propulsion. It's awesome on ponds, and i've used it to push upriver during low water. If you have a 40hp OB you'll be good to go for primary, but just know that 55 is an adequate backup.
Depending on how you fish and your budget, I would save up and get a motor with spot lock. This is an absoute game changer if you fish brush piles and other offshore structure. It's also good on rivers when you're moving from hole to hole. Throwing a traditional anchor out at every spot as your searching for active fish is inefficient, annoying, and hard on the back.
https://minnkota.johnsonoutdoors.com/us/shop/freshwater-trolling-motors?f[0]=minnmountinglocation:99281&f[1]=minntrollingmotorsfeatures:101946&f[2]=minnvoltagemaxthrust:100576
I've run the Powerdrive and currently have the Terrova on my 17' deep V. The Terrova is easier to deploy/stow than the powerdrive. If you go this route, make sure you get the model with spot lock and the GPS puck. My Terrova is the older model (2013) and Minkota made significant upgrades on the spot lock technology after 2016. While mine will hold over cover +/- 10-20' depending on the wind, the newer motors keep you "anchored" much tighter with better accuracy.
Garmin also makes good trolling motors, and their brushless models are awesome. However, they're going to push the price way up.