If you want to dump your Endura only for trolling purposes, I suggest you keep it and start trolling with your oars. You can break, you can impart the boat ( and thus the fly) all sorts of movement, you can even keep your boat against the wind in the same spot for a while if necessary...the advantages are numerous.
Plus, it keeps your hands busy so you don't snack, smoke or drink so much (an added bonus).
I used to troll a lot with my Maxxum and only after reading some serious articles written by people who have forgotten more about fishing than what I have learned so far, I came around and started trolling by rowing. My catch ratio has more than doubled since.
An electric motor is great to get from spot A to spot B in a hurry without tiring yourself by rowing. But for trolling nothing beats the oars.