By the logo on the door, that hook and ladder may be L.A. County. I compared that photo to a pic on the LACoFM website of a 1937 Seagrave pumper, and I'd say there's a good possibility the hook and ladder's tractor is also a Seagrave.
The best I find is a 5 wheeler under phantom person, Sir: Or at least 5 wheels and almost a person getting swallowed by Mother Earth?:
I. Press building fire, December 28, 1956. Philadelphia. As shown in the accompanying photo, the giant deluge gun was mounted on a 1941 Autocar chassis. It was capable of delivering 2,500 gallons per minute and had a striking distance of 320 feet. This piece had formerly been assigned to Pipe Line Company 4 which was disbanded in 1954. The Giant Deluge Gun was remounted in the 1960’s on a 1950 Reo chassis where it remained until the late 1990’s when the piece was placed out of service.
From my dashcam. As required by German law. I had to pixel out the license plate number. I left the H there, though, if you could tell it's an H which stands for Historical:
He should have turned around for the photo shooting. By the way those flags blow, it looks like he's speeding in reverse gear.
If he drove forward his hat would come off. The other possiblity is he's going forward slower than the tail wind from behind.
Here's a 4-wheel drive Vanagon getting auctioned. Being that the fire department were the original owners, the low milage stated is highly plausible. It's somewhat spartan. But, looks to be in excellent shape. Seemingly endless image gallery: https://auktion.catawiki.de/kavels/12807903-volkswagen-t3-syncro-1991
Those 'Syncro' Vanagons did make it to the U.S., as there's a guy several blocks from me who has two. But it's interesting to know fire departments in Europe also auction their older equipment.