I think the nominal size wheel for that tire is 28"x11", but you could go one size wider or narrower and get by. It the tires say that they are tubeless then you will need a wheel that is designed to be used with a tubeless tire.
 
I have a set of R1s that are the 2000 series of a common tire mfgr......can't remember the name....don't feel like going out and checking, but they are molded with: 13.6x28 on a 11 rim molded on the sidewall . Ford SMs list several tires for that wheel including your 12.4.
 

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