Hi i am going to buy a minn kota fortrex 80# bow mount but my question is what shaft length 45" or 52" i have a 24' sweetwater pontoon the fence & gate is on the edge in front ,any body know if the shaft is adjustable or stationary , any help would be appreciated , on another note i do live in oklahoma average wind is about 10 to 15 gusting to what ever sometimes .