I've never heard of a Witt Will make of truck
I never heard of Piggly Wiggly until I drove through Virginia, it's a big chain of grocery stores, and the above photo shows the Mack trucks that PW owned and operated. I find it interesting that the 2nd from the right has side lights
What a cool tow vehicle! Commentors on Shorpy had pointed out that in the early 20's it was cheaper to customize a formerly expensive and powerful luxury car to be a tow truck, than to buy a truck... I bet this was due to trucks being primitive, not much faster than 30mph, and a lot harder to come by than a used car http://www.shorpy.com/node/3988 and the sleuths at http://forums.aaca.org/ubbthreads.php/ubb/showflat/Number/531563/gonew/1/Pre_WWI_car_to_truck_conversio#UNREAD
found out that it is a 1911 Premier