Don't know if you're still checking this thread, but I got a 2010 Navigator 165 Sport and can't figure out what size trolling motor to put on it. I'm going with a MK Terrova (w/sonar), but Alumacraft rep and dealer say the boat should have a 54" shaft. It only comes in 48" or 60", so not sure which way to go. What length is yours and how does it work?