As luck would have it, I have just been sent a copy of "The Phantom Major" (The story of David Stirling and the SAS Regiment) by Virginia Cowles 1958.
The Jeeps were certainly a disposable item, and as there was continual improvments and modifications to all the vehicles that the SAS used as such I doubt that there was ever a definitive list of exacting modifications.
The first Jeeps carried 2 pairs of the Vickers "K" machine gun, one facing forward, one rear, both on the RHS. The "K" was used because (the army was unable/willing to supply machine guns) Stirling managed to find 12 of them held in storage by the RAF, who promptly told him to take the lot.
By Nov 1942:
"After a certain amount of experimenting, it was found that each jeep could carry (roughly): 2 men, 2 vickers "K" Machine guns, 12 mines, 1 rifle, 1 sten gun, 35 gallons of petrol, 40 gallons of water, 20 days of rations, kit , binoculars,compasses etc."
Petrol and water alone would weigh 340kg.
Nice pic here:
http://www.thesun.co.uk/sol/homepage...ite-force.html
Interestingly a pic. taken from a slightly different angle was used on the cover of the book, with David Stirling either out of frame, or possibly cropped out! This pic shows the far jeep carrying a .30 or .50 cal on the passenger scuttle, the "K"'s are on a very rudimentary mount bolted from underneath with the nut and quite a lot of exposed thread on top.
(Edit)just found a copy of the pic I am talking about, it will be the second below, (from:
http://twolftfeet.com/sas.html )
Single spare tyre, no windscreen. Well I can only see one spare, but as it is on the drivers side it must be a spare spare! Possibly mounted higher?
Just been looking on the net,and found the pic below ( from
http://www.forum.militarni.pl/viewtopic.php?t=1961 )
it shows the spare as being lashed on the back with straps.
It is only when you have a close look at period photos you realise how rough as guts these mods were.
So to sum up, make it fast, make it rough and don't make it like any others you see!
Rich.