Learn how to use your mirrors and how to back up a trailer some where besides a Saturday afternoon at the ramps. If you have people with you in a second car do not park it in the parking lot for tow vehicle most the time there is a parking lot for just cars near by.When you do get your boat to the parking lot pull to the farthest end from the ramp to prep your boat for the trip home.
I had to exercise my screaming voice last weekend. As I walked on the dock some dude was pulling his 24 is Bayliner out at the other dock.. He stopped on the ramp and I watched his boat slowly start to roll backwards on his roller trailer. It took him a minute to understand I was yelling BACK UP NOW!. He got it back in the water in time but I wasn't sure he would. I always put the chain on.
Maybe it was a ski boat with ballasts. Saw one last weekend being pulled out by an x5. After they got it on the ramp out of the water they realized why it was sitting very offside on the trailer and it took everything that bimmer had to get it on the dry part. They backed it in and drained the tanks. They were there when we docked and they were still there after I walked 5 blocks to my trailer came back and loaded and left with them still trying do whatever they were trying to do. We do see a lot of first time with the new boat boaters here so I don't stress it when it's on the other dock.