Thanks for the answer Dave! Interesting to read the Hellcat is powered by an R-975 radial engine.
Most of the vehicles driving around came from Germany and I don't think they would like (Or even be allowed!) to dress up like WW2 german soldiers.. Spectators aren't allowed to wear German gear either.
It is a great museum with a large (300+) vehicle collection, but most are allied vehicles. The armour driven around this weekend all came from other museums and private collectors around Europe. There's the Panther and a pair of 34's, but there are no German half-tracks in their collection.