For those of you that my not have spotted it or realised, 50-504 up for auction at the moment is the First production 6x6 GS, well worth getting if you can (I wish I could). Not Initial production, but ffor the 6x6 for the most part relates to The Strange Tale of 50-501, 502 and 503 as related on the main website here
http://remlr.com/perentie-project-LR.htm#strangeThe other 6x6 first production vehicles are:
50-572 (6x6 GS WW)
50-515 (6x6 Ambulance)
50-663 (Air Defence Rapier)
50-664 (Air Defence RBS70)
50-665 (General Maintenance WW)
50-666 (Maintenance Electrical