I have a '52 GMC 3/4 ton flatbed with the plate shown below. When I got the plate (around 2014) I tried to register it in Harris County (suburban Houston) and after 30 minutes at the county tax-assessor collector office, I was told that "FARM" truck plates were not allowed. They did not mention it being allowed if you have an ag exemption. I have an ag exemption, but not in the county where I lived at the time and where I was trying to register the plates.
So I got back into the truck and drove 20 miles north to the small town of Tomball. Walked in, showed the clerk my plates and paperwork, STAMP, STAMP, STAMP and I walked out with the YOM sticker for my plates.
10 years later and I'm still driving it. Now living on land with an ag exemption.
'57 GMC 102, Original 347 V8, HydraMatic, 3.08 rear gear, added A/C, disk front brakes, HEI, AFB carb, '98 Honda Black Currant paint. T-boned and totaled 10/12 '52 GMC 152 Stake Bed, Original 228, SM420, added A/C, HEI, disk front brakes, '67 Chev 3.55 rear gear. Gets used as a real truck.