Fmcsa regulation for rusted rims

I got a question i can not find the answers too online, inside the fmcsa guidelines handbook, or from a mechanic at the TA. So asking all veteran truckers now. I have looked and looked and even under the rim section it does not say anything about rust in the fmcsa statue book about rusted rims.
My companies trailers look like dog .
Some times the rims are rusted so bad. That i can take a ball point pen on the inside of the rim where its pitting and scrape up metal shaving like im peeling a orange. Now I know that eventually there comes a point where the structural integrity will fail and out goes that air, and off comes that tire, so it’s really surprising to me that i have not been able to find any text or law about how much rust is allotted on the rim the tire is seated on. Has anyone got a ticket for excessive rust on a rim? Do you remember the citation number and the statue that leads to the subtext? I feel like since this is more of a common sense thing it might be untouched, however some companies, my company does not care how their equipment looks and are just stingy. With fuel prices I don’t blame them, but at some point it becomes high risk and unsafe. So what are the regs?