JarFull

That's the same guy too

They are still in the game files even though the DLC is not released yet,

You can use a mod such as this - http://mods.wotmp.com/mod/20-ton-beyaz-dorseler.html to make all of the trailers boxes so then these trailers become visible.

http://imgur.com/a/mDThx Here's one I just found.