Yes. I have seen hay wagons with 6 lugs artillery wheels and plain hub caps. Not homemade factory bought. The above truck is probably the answer.
They're aftermarket, from Clark, Firestone, Motor Wheel, or any of the sellers of the early thirties "Jumbo" fad tires.
Yep. The Chevy spokes are ~sharper. And the ~centers look different. On the rusty ones the mounting flange is flat versus ~embossed.
What are jumbo fad tires? I'm finding "General Jumbo" artillery wheels. If anyone has an ad for aftermarket artillery wheels handy, please post.
Oh, I see. 8-spoke artillery wheels and big ol' balloon tires that look like they're for an antique airplane like a DC-3. Post #15: https://www.fordbarn.com/forum/showthread.php?p=2118285
Here's a thread dedicated to a member identifying artillery wheels: https://www.jalopyjournal.com/forum/threads/id-artillery-wheels.334574/page-12#post-15326405