Oldtimer Trekker without agricultural purpose!!!

Hey guys, I have a question for which I have not yet received a clear answer. I own the driving licence class B, which includes “L”. I, as a confessing oldie lover, would like to buy a Porsche Diesel Junior tug. Unfortunately, I do not have an agricultural or forestry use purpose, but just want to chuck through the country in nice weather. I also do not need a trailer or other work equipment on my trecker. I drive it with black plates without “agrarian-purposes” and let it normal? PS. he has a top speed of 19 km/h and weighs about 1800 kg. Thanks already in advance Tom