Just to throw a spanner in the works.. Because i always think of "Worst Case Scenario" things, If your child is sitting in the car, and you are off on the jetty tying the boat up so you can go park...
What happens if your hand break fails ???
I have a freind who saw this happen, whilst Father and Mother were launching up at Port Stephens, and luckily he was close enough to jump in the car, bring it to a hault and drive it out quickly. (By this time the front wheels on the 4x4 were almost submerged)
Just a thought.....
CHeeRS
Antun