When we stay at Munster we stay in the barracks so no need for camping, in this area I have no idea where or if there are any give me a few days I will try to find out
The Panther and Jagdpanther shown running belong to the Bunderswehr, WTD is an army base and only has events every 4 years the last one was last year, Munster also has a Panther A and Jagdpanther though these rarely run I think the last time was more than 5 years ago.
If you come to Munster 18-19 May RAG has a large event with the models at the museum
http://www.rag-modellbau.de/128259.html this would be the best time for you to come there are a few guys from Denmark who make the trip each year
Trier is a nice place to visit with a lot of history dating back to the Romans, it’s about 5 hours south of Munster