Are those tire ST or LT type? If LT then we just installed 4 new Goodrich Commercial LT tires on our TT. They have very good recommendations. Michelins are often highly rated but quite expensive. As to aging out that depends on the tire condition, are they cracked, lots of tread left? You have to make the decision.
Arctic Fox 25Y Travel Trailer
2018 RAM 2500 6.7L 4WD shortbed
Straightline dual cam hitch
400W Solar with Victron controller
Superbumper