The DoT had some other remarks, the most important being that the headlights and brake lights are too far from the outside of the truck and the pintle hook not being legal on civil vehicles.
I could get a new "fish-mouth" coupling with a large discount (left). Had a craftsman metalworker make a tube fitting the shaft of the coupling so the new coupling with tube fitted perfect in the assembly for the original pintle hook. So I have a legal pulling assembly but can change it back to the original pintle hook in about 10 minutes.
The new rear set-up with the new fish-mouth coupling, Dutch military rear lights, and a new electricity connector for the trailer.
Headlights also was not a real problem, thanks to Jan being a "
Lelijke Eend" (Ugly Duck) fanatic. I removed the original nightlight lollipops and replaced them with headlights of the Duck. Problems solved and it even drew a respectful smile of the DoT inspector

.
For those interested, the Lelijke Eend (Ugly Duck) of gewoon "Eend" (Duck) is de common Dutch name for the iconic Citroen Deux Chevaux, which means 2 HP.
And done: the Dutch RDW (DoT) certifies the truck with a wink and clear understanding that it gets the heck out of the Netherlands and does not come back or face a next inspection that will a lot stricter. Here, the inspector is punching the original serial number as new Vehicle Identification Number into the chassis.
My truck is now street legal with the following specifications:
Basic empty truck weight: 22,222 lbs.
Max allowable weight 42,472 lbs
Max allowable drawbar trailer weight: 68,460 lbs
Max allowable semi-trailer weight: 68,460 lbs
Gross combined vehicle weight rating: 90,462 lbs
I found out much later that these numbers are valid as long as the truck drives under a Dutch license plate. As soon as I formally import it, the Czech authorities have to decide if they accept this without further inspection or if they want a complete new classification.