Love mine! I put my transducer on the trolling motor since I fish from the front. If you put it in the back, regular rtv silicone will seal the holes. 54lb trolling motor, no outboard. You're right that transom is a little flimsy but you should be able to get a transom saver and cut it down to work. I've used several of those trailer, they do fine but maybe consider replacing with 12" tires if you have 8s.