This was posted on The Old Motor | Old car photos today. They had in turn posted it from the Hemmings Blog. This AA panel truck was used to tow the blimp in and out of the hangar.
An interesting post by Mike Bumbeck at the HMN blog, telling all about the Goodyear blimps and pair of control gondolas that are on display at the Smithsonian. The Model AA panel truck that guides the Pilgrim is quite interesting also. Photo courtesy of the Goodyear Tire and Rubber Company.