I'am looking at purchasing at 2008 1856 G3 Gator Tough boat with no motor. Trying to figure out what motor i can put on it and stay at bout 25 mph cruising with two men including my self. My buddy has a the same size boat in a Tracker Grizzly with a 40 4-stroke Merc and we can do the above no sweat. I have been told that the G3 are quite a bit heavier. Leaving me to wonder if a 40 will be enough. Appreciate any input.