There always will be sales...... Yes they recommend to replace tires after 5 @ 6 years, (here is an large tire shop who recommends 3 years) but ask yourself who's wallet they are talking about. On RV's and Utility trailers I change them every ten years, because they are usually worn by then and some hairline cracks show in the rubber. I only had a few failures over the years. If you looked after your tires then keep on going.
2014 Ram 1500 CrewCab 4x4 5.7 Hemi 3.92 Rear and Air Lift 1000
2005 Jayco Jay Feather LGT - 29Y GVWR-6500 lbs.
Pro Series 1200 lbs. WDH with Double Sway Bar.
Champion 3100/2800 watt Inverter/Generator-Onboard Solar Power
ALJO 'Forever Young @ Heart' provide on their travels Music Entertainment to Senior Care Homes