Okay folks, I'm operating here from a near total lack of knowledge. After visiting Hugh Walter's awesome Small Scale World blog I was able to piece together that these mini-trucks are essentially based on the popular British Army Humber all-purpose truck.
After looking at Hugh's photos, this truck appears to be a Type 1 Radar as it sits lower on the truck bed than the other radar arrays. However, the truck chassis looks like it could be a Type 2? I'll need clarification.
One of the things I forgot to do back in 2020 when I took these photos, is to snap a pic of the undersides to see what, if any, markings there were. Trying to find these toys out in The Cave will be a real bear now so we'll make do with the photos I have.
A note on size. These trucks are small! Smaller than HO (1/87) scale or 1/72 Scale.