History ...

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6 holes are usually Chevy.
Looks like 16 or 15 inch. by the tires. They could be farm wagon.

 

41-46 chevy truck

 

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.

 

The above trucks wheels appear to be a little different.

 

They're aftermarket, from Clark, Firestone, Motor Wheel, or any of the sellers of the early thirties "Jumbo" fad tires.

 

Here's another photo with the wheels off the truck and one without the cap

 

Yes aftermarket.

 

Those are '35-'36 Chev Master or pickup 17'' wheels.

 

These were 16's

 

The aftermarket businesses made the "Jumbo" wheels in several styles - wire, disc, spoked, & solid.