After reading all of the post I am glad I kept my class A license and endorsements. Plus yearly med card due to my S endorsement.
Its a pain and expense to get them now. Buddy of mine retired after I did and gave up his saying he would never need them again.
He calls me the other day asking if there was a way for him to legally drive a borrowed non farm triaxle. Told him to go get his license.

Seems like all the states have their own extra rules over the mandated fed ones. At times it seems not only confusing but contradictory.
You can always locate your local dot officer and ask them for guidance.
Another resource may be your states farm bureau insurance. Ours has the farm rules broke down in plain English and guidance for what can and cant be done.
My F 700 is below cdl and farm tagged but I hope to get a gooseneck trailer for it.