This was one of the response vehicles last weekend at the Goodwood Members Meeting in the south of England. What a great utility body! I could find a lotta uses for that design...
Here's what might be inside that body, from a website reference. Not so interesting inside now, I'd say. Doesn't look like it has a lot of room, even without the hose and pump. Perhaps there's an onboard tank that needs to be lost, too.