Got another question about the 2010 TX175 Pro. The trolling motor on the boat is what looks like a 55 inch shaft. Most others I have seen spec the same. Why does the shaft have to be that long? Wouldn't a 42 or 48 work just as well? I am thinking of upgrading the current 12 volt to a 24, and I would like to put a shorter one on the front. Thanks.