I can sympathize with you.
In twenty years of hauling a trailer, I have never had a flat or blowout.
Last month on the Tamiami Trail in south Florida I had a blowout.
I put on my spare which had never been used and the next day I bought a new spare.
Then two weeks later on I-95 that spare blew. Try changing a tire in the breakdown lane with tractor trailers flying by at 75 and 80 MPH's
After I changed it to the new spare, I bought another one and was paranoid all the way from there to NC where we live.
I always check the pressure, and constantly do a walk around and feel the tires and hubs for heating while I am traveling.
Before we head out again, I am going to replace the other three tires even though they still have good tread.
Jack l