Sorry, Crofter, but IMHO, if I were that cautious, I would never go onto a public highway again in a vehicle. I think the chance of me being killed is greater than the chance of getting AFB from used equip., even tho both chances are certainly a possibility. In 35 plus years of beekeeping and visiting beekeepers, some commercial, I have only seen AFB once, and it was in established hives which had been established for years, not new installs in used equip.
That being said, I will repeat my often stated fact, beekeeping is very localized. If there are many known instances of AFB in your area, I would expect you to be much more cautious.