40 mm Bofors AA guns made in GB and US

[David_Hayward (RIP)]

Stellan, what then happened in early 1944 then please, as the Tractors became Self-propelled units with no trailers? I can imagine that new US equipment came on line. However are these Canadian guns can anyone say please from the photos? If they were British-built then Pearsons added the guns to the bare chassis on assembly and then coupled up the US-built trailers. The IWM has an official shot of a H-prefixed tractor. I have photos as I mentioned before of tractors and rebuilds.

Thanks!