Tire mfg date code/sales

I have run tires older than 10 year old on the road before, but only on a trailer, not the tow vehicle. I don’t tow campers, mainly open utility trailers. I inspect tire condition constantly and even have a new set available in my garage to install on the box trailer next time I need to take it farther than 5 miles as the tires on it are dry rotted and will not last long, but I left them on to protect the new ones until needed, and then I will make the switch out.

If I bought new tires for the trailers every 6 years regardless their physical condition I would go broke, as I only have 10 trailers in rotation, and this is personal use trailers, not for a business.

However, I am always checking tire date codes and tire condition, especially when buying a used trailer, or vehicle, as that is a negotiation point.

So far I have never had a tire blowout on a trailer, so my method must be working.