If you are interested in Tanks than you should visit the Panzermuseum in Munster which has a pretty large collection Tanks from all nation. Uniforms and other pieces of equipment are also shown if i remember correctly.
http://www.panzermuseum.com/
It is located in Munster in the Lüneburger Heide not too far away from Hamburg, easily reachable by car and well worth a visit. I was there myself some years ago.