That must have been a veeerry slimy ramp.
I've slid down a few slimy ramps on my arse, but I've never seen a truck slide down one.
Speaking about boats floating off, I almost forgot that that happend to me this past summer. Never mind what stupid thing I did to allow that to happen, but the wind was blowing and the boat was drifting away from the dock. Nothing to do but jump in a swim after it. I assume it's deep because the ramp is so steep. Anyway, there's no one around so I undress to my skivvies, leave the pile of clothes on the end of the dock, and jump in. It's only three feet deep! I walk over to the boat, three feet deep all the way, and tie it to the dock. No need to strip down after all.
That's when the landing suddenly got busy with families out for a Sunday boat ride. And I tell you what, there's no trees to stand behind at the end of the dock.
I just hate being the idiot at the landing.
Rick