The surplus 20" aircraft tire was a common swap onto all sorts of different contraptions. (15.5x20 from the DC-3 on these trucks in the video)
Alaskan "Tundra Buggies" were using high flotation aircraft tires well into the '70s when my uncle told me about them.
But surplus aircraft tires were available cheap (and being used) all over the U.S.
Witness the "Tumble Bug" in the early 1950s Swamp Buggy Races down in Florida-
Mac Wood's Dune Rides in Michigan has used aircraft tires for decades on their Dune Scooters
I could go on and on, and I haven't even gotten into the commercial users of surplus aircraft tires (thanks adam521i for opening that door), but suffice to say, there is a very good chance that this wheel/tire combo's last use wasn't an airplane.