I have towed both Aluminum DB's & Fiberglass DB's for years w/ the kicker motor mounted on the boat. In all those trips, I have only encountered one problem, and that was my fault, I forgot to tilt up the motor. When towing, be sure the motor's tilted slightly, so as to not hit the bottom of the motor on driveways as you are leaving a steep location onto the street. My 8 hp Merc will come up 2 clicks when in gear and stay there while towing. You should also use a bungee cord and keep the motor from swinging back and forth while towing as well. Just a couple bits of advise!!