Joe,
Yeah, after I posted and looked at the pix, I thought, "hey . . . that truck looks familiar!". At our meeting, we even found Qulin on a map. Wow, puttin' out a fire at Mark Twain's home - didn't think the truck was that old! (sorry, couldn't resist

)
Guess you've started figuring out about the primer and the governor, too, from the looks of the photos. The hole in the fender is prob. from the Primer pull handle. Was there an auxiliary cooler under the hood as well? Usually a fairly crude box shaped contraption with lines running to and from it, above the radiator.
Keep us informed, always interested.
-Mike