This is a modification which attaches trailers to all the vehicles (of course, those which are intended for it). Trailers are automatically attached only to vehicles generated by the game. This mod does not create new vehicles with trailers on the patch. In addition, my modification does not attach trailers for vehicles created by SCM during a mission, so you do not have any problems with this mod.
This mod requires an installed CLEO library.
SORRY FOR MY ENGLISH
You can download this modification on my blog: gtabyartginpl.blogspot.com