Once you’ve loaded the trailer, you can add a cover to protect the load. And when you want to load the trailer manually, you can unfold the sidewalls for easier access (by pressing the “N” key on your keyboard.)

And yes, the trailer has a rear hitch, making it possible to make a (really) long road train…
FS19 Kögel (Autoload) Flatbed

Here are some cold, hard facts about this useful FS19 mod:
Brand: Kögel.
Modder: CrowerCZ.
Category: Baling Technology.
Base price: 36,030.
Capacity: Some examples – 20 pallets, 39 large square bales, 48 round bales, and 3 cotton modules.
Selectable colors: Yes, for the rims.
Selectable wheels: Yes, single or dual wheels.
Wheel brands: Lizard.
Errors: Just a tiny one.