What kinda Hauling is this ?

I knew that you and @Lepton1 would be one to chime in. Anyone that's ever had to deliver to a mine, or a rock quarry or some site built on the side of a mountain has already done it.

 

I've gotta run roads like this in my transfer dump. I thought I had it hard getting into gas stations in a tanker...

 

I would love to do that!

 

Found the actual YouTube page and that guy lives around the Sedro Wolly area of Washington.

 

The way these trailers are built they actually use the logs as a trailer and the trailer tires actually follow the truck tires almost to the T with very little off track.

Its kind of difficult to explain how they work but essentially the logs stretch across the bunks which pivit on the truck and the trailer. When loafing they unlatch a hoop on the tounge of the trailer that holds a rod (compinsating bar) that slides into the tounge. As the truck turns the rear of the frame/stinger, 6+ feet behind the center of the drivers, steers the tounge of the trailer in the opposite direction and the trailer will follow the trucks tracks. This is why they need the compensation bar as it slides in and out of the tounge on the turn. This is the same truck the OP posted and you can kinda see what Im talking about.

 

No big deal. I spent a lot of years doing that and still do it occasionally when we're short of drivers.
The road pictured is actually a decent one. Picture that same road after a hard rain or with snow on it.

 

As a rule the tailers don't collapse. We carry them back to the woods.

 

He may have seen self loaders where the reach folds.