A large number of Entegra Coaches and other brands come equipped with the Goodyear G670RV tires on them. I and several other Entegra Coach owners have experienced a sudden catastrophic tire blowout on these tires. There is currently an NHTSA inquiry underway for these tires. The link for that inquiry is here. https://static.nhtsa.gov/odi/inv/2017/INIM-PE17009-71798.pdf
Additionally, if you have suffered a tire failure with one of these tires or any other for that matter you can file a complaint with NHTSA here. https://www-odi.nhtsa.dot.gov/ivoq/Complaint.cfm
I am not trying to start a panic here but to merely inform you all of my personal experience. Do not rely on the age of your tires as mine were only 4 years old with less than 33k miles on them, showed no dry rot and my coach has not sat for any extended period of time. Many of the other tire failures were on tires with less than 35k miles on them. Some had as little as 12k miles.
You can check your tire's date code that is stamped on the sidewall. It is a 4 digit number in its own circled area on the tire, Similar to this (1214). The first 2 digits are the week that the tire was manufactured and the second 2 digits are the year the tire was manufactured.