Cool photos. I would guess these were Personnel Carriers converted into fire trucks. However, they may also have been a cab-only chassis as well. The serial numbers would tell us more. You can see a few more photos at the bottom of this CJ-3B page.

https://www.alamy.com/st-george-fire-brigade-car-1-july-1962-st-george-fire-brigades-car-1-converted-from-a-willys-jeep-truck-the-queensland-government-supplied-these-units-to-small-rural-towns-in-1961-the-chassis-were-built-by-willys-motors-australia-pty-in-brisbane-and-the-bodies-by-enoggera-motor-body-works-image188710782.html

“St George Fire Brigade Car 1, July 1962. St George Fire Brigade’s Car 1 converted from a Willys Jeep Truck. The Queensland Government supplied these units to small rural towns in 1961. The chassis were built by Willys Motors Australia Pty in Brisbane and the bodies by Enoggera Motor Body Works.”

PHOTO CREDIT: https://www.alamy.com/st-george-fire-brigade-car-1-july-1962-st-george-fire-brigades-car-1-converted-from-a-willys-jeep-truck-the-queensland-government-supplied-these-units-to-small-rural-towns-in-1961-the-chassis-were-built-by-willys-motors-australia-pty-in-brisbane-and-the-bodies-by-enoggera-motor-body-works-image188710782.html? .. It can also be found on Flickr.

This example calls Mattaburra, Australia, home:

Here’s another example. The pic is small.