http://www.flamesofwar.com/Default.aspx ... _cat_id=18
''The Brigades AT Battery, the oddil K.P.U.V under Maj. A.Sitek initially contained two troops of 17pdr anti-tank guns, initially towed by Chevrolet 30cwt trucks, later by Morris EA 4 x 4 vehicles. A third troop was added in the winter of 1944/45.''
Ive checked in "Czechoslovak Independent Armoured Brigade" a truly excellent book published in 2011 by Capricorn Publ. and written by Tomas Jambor and Petr Brojo. This is photobook containing houndreds of large and clear photos.
There are several photos of 17 Pdr, mainly from training. In these photos none of the guns are pulled but in the background you can see Morris FATs, I suppose these are the vehicles the webpage you found are refering to.