I was wondering if anyone could say if the semi trucks can interchange with their trailers as in Snowrunner?

I have noticed in the various screenshots and video trailers that the "Semi Truck" appears to be a truck/trailer combo.

Does this mean that we cannot change trailers with different tractor units?

During the video, when it gives a brief overview of the truck store, you can see that the truck comes with a trailer.

Also during all the promo trailers you can see it is always the same truck with a trailer, though the paint jobs change.

I am hoping to be proves wrong on this.

I am looking forward to trying out the demo, so this might be answered then

No vehicles come as they are, designed for specific tasks, there is no need for a plethora of trailers. If you need a truck with a trailer a truck with a trailer will be provided for the contract, or discoverable on the map...