Originally Posted by cyccommute

The "tongue" of a trailer is the bit that attaches to the towing vehicle. In the case of single wheel bicycle trailers it's more of a "yoke" (although BOB calls it a "fork). Whatever you call it, it's the bit that attaches the trailer to the bike...but it isn't the quick release skewer.

My trailer is a Yakima which is a copy of the Bob. It has a slightly different attachment but it's very similar to the BOB. To attach it, I pull the trailer up close to the bike. I then lean the bike against me and, while facing back towards the trailer, I drop the "yoke" (tongue, fork, whatever) onto the skewer. I have hairpin cotter pins to keep it from bouncing off.

To remove the trailer, I remove the cotter pins, lean the bike up against me again, reach down and pull the trailer "fork" up off the skewer. It's easy peasy. Just like when you lean the bike up against something.

Go practice it without a load. You'll get the hang of it pretty quickly.