As well as a superb collection of original and replica WW1 aircraft, Peter Jackson also has several vehicles, as seen here (he also has an 18 pounder and a German 77mm gun)
http://www.flickr.com/photos/flissphil/3511699613/in/photostream/
Replica Mk IV Male Tank
http://www.flickr.com/photos/flissphil/3511679143/in/photostream/
B type Bus (I love the fact you can see the civilian colours showing through)
http://www.flickr.com/photos/flissphil/3506324501/in/photostream/
Truck, I don't know what type, looks American though
http://www.flickr.com/photos/roblangham