In the 1938-1940 period the Dutch Army ordered a large number of light artillery tractors or Anti-tank gun tractors from DAF (Van Doorne's Aanhangwagenfabriek) in Eindhoven. In Dutch these were called PAG-trekkers, PAG meaning "pantserafweergeschut". DAF built these on both Ford and Chevrolet chassis by converting them to four wheel drive and adding specialised bodywork with 3 rows of seats for 6 crewmembers and ammo storage in the back.
I have never come across a total number ordered or produced, but since they were used to tow the Dutch Boehler 47mm anti-tank guns - of which there were approx. 350 - such could be the number built by DAF: around 350. There are also reports of the vehicles being used as staffcars or personnel vehicles, but that may have been exceptions.
On top of that several versions seem to have been built, possibly 7 or 8.
Time to take a better look at this vehicle. Bart Vanderveen wrote extensively about the DAF Ford and Chevrolet connections in his Wheels and Tracks magazine, so that's where I base this first step on. But even he is not clear about everything. Recently a thread at the Maple Leaf UP Forums delt with PAG-trekkers: http://www.mapleleafup.org/forums/showthread.php?s=&threadid=2478
Certain is that the PAG-trekkers were built in several batches, differing by model year but also bodywork. Perhaps the ordering of the batches to be built was synchronised with the completion of orders for the anti-tank guns?
I will start two-subthreads, one for Ford versions and one for Chevrolet.
Enjoy and be welcome to post your PAG-trekker pictures for precise identification!