Keith,
It certainly looks like a powerfull combo, very much similar to the german FLAK trucks and halftracks.
Have a look here for some more shots and info:
http://www.mapleleafup.net/forums/showthread.php?t=6473
on a side note....I wouldn't be surprised if the pictures of the vehicle in post-war Dutch service and the one(s) during demo's in may 1945 are all one and the same vehicle.
Alex