re: Boat launch comedy

Went fishing with a friend and his friends boat up north. First time I was introduced to a trailer with rollers. Boat is a 24' deep vee, I unhook boat like I've always done on a skid trailer while everyone else is getting ready. About halfway backing down the launch the boat takes off the trailer hits the launch and slides about 15' on concrete. Luckily motor was up and didnt hit, had to push boat another 10' to float it the re-trailer ed and luckily only some gelcoat damage on the bottom of transom and some minor scraping from the concrete.