Most small trailerable sailboat motor mounts are designed for carrying up to 10 hp motors. With the 23, you are overpowered and it weighs more. I would take it off and store inside forward of the boat or in the back of the tow vehicle. It wieghs less as I suspect it is a two stroke. However, if you are insistent on leaving the motor on the bracket or motor mount, put a line around the handle and tie it upwards to something on the boat to help allieviate some of the wieght and to keep it from bouncing.
I have over two million miles of trailiering sailboats and the above is based on experience also as a former dealer.
Crazy Dave Condon