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Keeping tires protected from UV and coating them with 303 can certainly help. Of course maintaining proper air pressure for the weight they are carrying goes without saying. But with original tires it is difficult to stick with the rule of changing them out at 5 years.
For example, Thor gets your chassis from Ford in 2012 and they build the motorhome. In many cases that unit will be titled as a 2013. The new owner figures he doesn't need to replace those "2013" tires until around 2018. But in reality Ford probably got tires manufactured in 2011 to use on that 2012 chassis, so those tires that came on your brand new 2013 Thor should be replaced around 2016.
My coach is a 2014 (VIN) and 2015 (Thor coach build), but since it was originally titled in Illinois and not Florida it is a 2014. I haven't located the date on my tires yet but I would be willing to bet they were made in 2013. I will be pricing the change out next summer no matter what they look like.
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Full Time in 2017 Newmar Ventana 4369
pulling a 24' enclosed (Mini Cooper/Harley/Kayak)
(traded 2014 Thor Challenger)
US Army 70-73 Retired LEO
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