Solved H Series flatbed not working

H series flatbed does not work, anyone have any ideas what mod could cause this?

 

Jammie599's openable mod causes it. If you have it, then the roll back flatbed of H-series and D-series will not work. The one for the T-series works anyway

 

Thank you for help, I will make sure to disable the mod

 

i noticed that too
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thanks guys i deleted it, but why some old car mods doesn't have sounds

 

Because they're old and are not compatible with the current version of the game