Im assuming that is the Remastered Gavril D-Series. With the Body-on-Frame separation like the Grand Marshal.
The D-Series currently is not properly body on frame. Try clipping the Bluebuck or GM's body on a pole, the body will come off the frame. Now try again with the D/H-Series or Roamer.
Well it was stated my BeamNG themselves, so confirmed is still appropriate. https://www.beamng.com/attachments/capture-jpg.605692/