This is Fliegl Animal Transport – Single & Double trailer mod.
And here is update 1.1 mod by Jazzycat for American Truck Simulator, 1.29 tested.
Download updated Custom 2015 Reitnouer Maxmiser trailer mod for ATS.
And here is update 1.7 of the Trailers and Cargo Pack mod made by Jazzycat.
Download Trailers Pack By Cerritos & Fabias for American Truck Simulator.