Trailer Hatch

In Fly Fishing it's all about the "hatch".

A hatch occurs when all of a sudden a gazillion bugs begin to show up on the water.

There are other hatches as well: the "tuber hatch" occurs when a bunch of (most often) young people begin to float down the river in inner tubes.

Then there is the "trailer hatch". That's when all of a sudden the parking lot is full of cars with boat trailers. What has happened is that all the guides have entered the river about 6-8 miles upstream and the shuttle people move their cars so that when that take out, their car is in the right spot.

What a trailer hatch looks like. Notice that they are all trucks! You never see a car in a trailer hatch.