I don't think there is a good answer to this. the rubber will start deteriorating from the air, and environment however sun exposure will accelerate it. So tires that were stored in a climate controlled environment for 3 years before mounting may be good past your 5 year number.
also there is no set time period, many people say 3 years at least on the cheap factory tires, personally I will replace the factory tire before they are 3 years old. better tires 5 is probably reasonable
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2024 Artic Fox 3018 5th Wheel
Grand Design 2800BH TT 2021 - for sale
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TV 2024 F350 DRW - on order
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