Re: Engine mount trolling motor.
Have transom mount troller & aux. bracket.
I did that on my 18'er, put an Garelick outboard aux bracket on the boat and mounted a 70# transom mount trolling motor to the bracket. It works great,,, but I had to do some re-engineering of the bracket as I didn't like how it made popping and clicking noises while I was turning the trolling motor. I made a couple side plates out of 1/4" aluminum and replaced the adjustment bar with a couple of fixed bars. The bracket is no longer adjustable, but it's rock solid.
When and if I ever decide to put an aux outboard on the boat, I'll just put the bracket back together as Garelick designed it.
Oh yeah, I looked at the engine mount trolling motors and didn't like them. They are limited to the steering of the main engine and since I have a trolling plate on the main, I would be dragging the plate all the time, lots of additional drag that the trolling motor shouldn't be pushing. Even without a trolling plate, you would be dragging the lower unit and prop through the water, extra drag and wasted power....