Why do so many Americans hate European trucks?

As the sides are hinged at the bottom,the material falls clear off the truck.
Those sides are raised and lowered by hydraulic rams.
Think 98989 has pictures off those.
Nice versatile system.
Proven technology as the Germans have been using that for donkey years.

 

What does mean wholes?

Do you mean of vertical part placed behind tailgate?
If yes they make it to prevent material to go sideways. It is not really needed on 3axles because body has longer overhang from tipping arm and thereby it sits lower to ground

 

In this case both red trucks got sideboards hinged only up, orange truck in back have both up and down.
None od them is fitted with hydraulics.
We can get from factory only hydraulics on left, and it is hinged only on bottom.
We had a truck fitted with austrian body that could open sideboards from below and from upper side fitted with hydraulics so you never had to get out of truck. Also one with pneumatic hinges down, it was fitted with springs

 

Sorry, I misspelled; I meant holes.

 

After looking at this more closely, it appears that the tailgate opens inside these holes, and that must be what you meant by pinning the tailgate.

 

Yes you will put pin inside to adjust how much material you want

 

Sorry Mate, But can't quite remember.
I think you pulled (or pushed ) the Stick against a Detent & It Moved.

One of the Drivers spent quite bit of Time in there. He's currently on Holidays. I'll ask Him When he gets back..

 

While you are asking him..............how do you release the tilt and raise off the steeringwheel?

 

Tail spreading ....