C30 engine cover

[David_Hayward (RIP)]

I believe that the 'unknown' trucks were probably also WIRE-3:

3844123735 ENGINE WR3,937,085 ORDER S/M 6051 13 OCTOBER 12 1943
3844123813 ENGINE WR3,936,594
3844123892
3844124112 ENGINE # WR3,935,335 ORDER S/M 6051 OCTOBER 18 1943
3844124131 ENGINE WR3,936,949 ORDER S/M 6051 OCTOBER 18 1943
3844124222

S/M 6051 covered L 5584483 to 5585063 "LORRY 3 TON 4 X 4 WIRELESS (HOUSE)" and it seems that I have a copy of an official photo in my collection: IWM PHOTO KID 3042