[gordon]

They all look like WDX types.

The last one is a standard truck, the second variants are chassis and windscreen cowl, and the first couple of photos are the same, but with running boards and rear fenders as supplied for firetruck building.

Pretty much the same as WC 3/4 tons, but most had the rear axle with the offset diff to allow a rear PTO shaft. This axle was virtually the same as the intermediate axle on the WW2 6 x 6 truck which had the same offset, but the combination of one short and one long axle shaft under heavy load resulted in a sizeable number of shaft failures (no jokes please...) to the point that some had WC rear axles fitted.

Other differences ? well most had tube shocks rather than the WC knee-action type, and the transfer case had a different ratio split of 1:1 and 1.5 to 1, which gave seven usable forward speeds (the low ratio on the WC series 6 x 6 was 1.96 to one or thereabouts which meant that the number of usable ratios was actually less)