Problem Trailer in FS19

[Engineer_cheb]

Good afternoon. Sorry for my broken English.
What could be the problem?.
When filling the trailer, falls into the ground, do not know why? https://ibb.co/1LVq0KY

Edit don_apple: topic moved from 'WIP Mods' to 'Modding', since 'WIP Mods' is intended to present mods ypu are currently working on (WIP = Work In Progress).

[RB Modding]

You have add the shader at the wheel?
Shared source: vehicleShader.xml
Viriation: tirePressureDeformation

Remenber, separare rim and wheel