Originally I wanted to depict a truck running into an ambush in Afghanistan, but later opted for a BRDM instead. Smaller and easier to build, and presumably more likely to run into a trap. I was thinking of the crew poking its heads out of the hatches and realizing, "Hey, we didn't anticipate this!"

So how would the crew be dressed, and what sort of trap might be set? I'm assuming a roadblock or similar.

There are movies on Youtube of such scenarios.
https://www.youtube.com/watch?v=7FBwj0FJfAg
You could make it part of a convoy with the road going through a narrow pas.