Where do I get the trailers?

[Taximan20]

I downloaded a trailer mod, but I go in the game I don't know how to get the trailers to spawn! It looks like a great mod and I am sure its not broken because no one else has this problem, I never used mods so its probaly my lack of inexperence.

BTW, here is the mod: http://www.beamng.com/resources/trailerpack.734/

[Taximan20]

You can access the Extra-Trailers via the Vehicle Configuration Menu.
Reference: When BeamNG is running, click Escape Key to open the menu. Then, click the icon with the gear, this is the Vehicle Configuration Menu. Once this is opened, open the Frame tab. Then, scroll down to Tow Hitch, click it. Lastly, select Small Trailer, "Small Trailer" and "Giant Flail" are made by BeamNG, others are part of this mod or other trailer mods. Hope this little lecture helped you install trailers!

[mr.v]

From my config itams available are:
Tow Hitch: Fast-eners, Receiver hitches
....Attachment: Ball hitch, Drop hitch.

There are no Giant flail or any trailer.
Is it only available on old version?