It's also because you have changed the size of the trailer, so the exactFillRootNode doesn't support to be resized

well, i changed the size of the trailer a bit but when i slect the third body (using LEFt SHIFT + Z, my controls) and i drive next a forage harvester, the pipe turns but he is not driving. also when i drove myself the trailer won`t fill up :/

Hi,

You must have the third body to harvest corn silage ;)

You can switch the body using the key shift + W

it won`t accept corn silage :/