New cruiser, we do the same thing! We put a piece (about 8 inches long) of duct tape on each side of the luggage, plus front and back. That way we know which piece of luggage is ours at a glance. And when my beach bag broke at the port, I just repaired in on the spot!
I did use the suction hooks and would bring more next time. Forgot the extension, would have used it. Couldn't find a cheap over the door shoe thing on the day we left, would have used that too.