I can’t spawn a trailer in career mode

Hi, I have a problem with spawning any trailer in career mode. The thumbnail is how it looks when I try to spawn a trailer.
I’ve tried changing the car, the hitch, the warehouse and even the save but nothing worked.
I have the highest level in the package delivering thing so I think I can haul the trailers.
Thank you.

 

then spawn a trailer

 

Problem solved: i had to download the rls mod