I just purchased a 2004 crest fishing toon powered by a 140 hp Johnson 4 stroke. I am going to get a new minn Kota ultera trolling motor for it. I am looking at the 36 volt model. Has anybody had any problems with these motors and so what kind. I have a 24 volt ultera on my walleye boat and love it. Thinking about the big motor because of the size of the toon and the extra thrust. Thanks