The bottom line is that any tires have a life span of six years whether you use them or not. The spare getting the free ride on back is drying out as fast as those on the ground.
A new tire in dealer stock is toast after six years which is why everyone should ask your dealer to record the DOT number on your invoice and write down the manufacture date of each tire as indicated in the DOT number. If they will not do that for you, move on to the next dealer.
Six years is the maximum. I would never buy a tire which is over one year from date of manufacture. Trailer tires over four years old are probably an accident waiting to happen.
I am sorry that your vacation has been so stressful. I had the brakes on my Class A go to the floor while approaching gas pumps. Missed the pumps by about a foot while going about 20 MPG. I saw my life flash before my eyes. Thank goodness that I had unhooked the tow and my wife was driving behind me. Ruined my whole vacation.
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