My wife's cousin was going through them hand over fist until I told him to get heavy duty bias ply sho nuff trailer tires. Now he's had the same set for like three years and they're still going strong.
I get a lot more miles out of bias ply versa radials.
I now just have a 18' open car hauler w/ two 3500# axles and a small 12' w/ one 3500# axle. I had a 40' open w/ two 7000# that was a real heavy trailer. I ran F rated tires and it would still go threw them. I carried two spares on long trips with that pig. Back in my contracting days I had a few equipment trailers.