This bug at the moment only affects the Azov 42-20 Antarctic, but I guess potential future trucks with articulated steering and truck carrying capabilities would be affected.
What happens is that as soon as you pack a truck on the flatbed/sideboard frame addon the articulated steering is getting blocked by that truck. When you try to steer in either direction it even looks like the packed truck is getting bumped in the process, but no matter how hard you try the articulated steering remains locked in the very place it was when the truck was packed.