Originally Posted by Delftblue Daybreak

There is also a GSE-set made by Herpa: http://www.herpa.de/pics/560948.jpg

The best and most detailed GSE vehicles so far are the ones made by Dragon, here you can see photos of them:
http://www.delftblue.de/400_scale/GSE_400.htm

Also Aeroclassics made some GSE parts (most parts metal), but there are only available together with airliner sets in different c/s and contains some classic vehicles.

Stefan