Welfare Vehicles

[David Herbert]

Matthew,
You are correct, OX is 1 1/2 ton (30cwt) capacity, short WB. OY is 3 ton capacity long WB.
There was also a 15cwt MW, which was even shorter and although the scuttle/firewall of the cab was the same and the engine and transmission was identical to the larger ones, the bonnet(hood) was longer and lower and the whole truck had a lower profile. All these model letters would have a third letter added depending on the intended use of the chassis, D for a GS truck, C for a chassis to be fitted as a tanker, W for wireless truck, and a few more.

David