There was some good information provided by the Michelin representative at the Prevost Expo specific to 365 tires.
-- All RV tires are now protected by a 7 year warranty, as long as they are less than 10 years old. This includes all tires less than 5 years old that are currently in service. Warranty start date is:
-- the date of installation, if you can prove when they were installed.
-- date of purchase for new vehicles.
-- Born on date if the installation can’t be proven.
-- A properly stored tire should have no adverse effect on tire life, except the hard line discard rule at 10 years from the DoT born on date. Stored tires need to be laid on their side, not standing up. They must be in an environmentally controlled environment without UV exposure.
-- Tires that are 5 years old should be inspected annually and regardless of their condition, 10 year old tires should be discarded.
-- 365 production runs are twice a year with no information provided on how they size the run.
-- 365 tire is not constructed like the 315 tire. They are constructed like super singles that require a much different build to keep the wide tread flat on the road. This construction technique has an added safety feature. If the tire has tread failure it’s designed to shed the tread while staying inflated. Of course, this can’t help if you experience a blowout.
-- Michelin does not have visibility into stock levels of tires once they leave the plant and no visibility into how tires are sold to dealers from distributors. This explains why there are times when it’s assumed there are no tires available with two year old tires surfacing just months after they were not available.
-- Petroleum based tire dressings should be avoided. A good test is to dress a clean tire and after 30+ minutes wipe it with a white rag and see if it sheds any black color. If so, don’t use it.
-- Wheel position weights are essential for proper inflation.