I dumped ST tires (C/D/E) years ago when pulling non rv trailers for a living. Too many ruined tires and down time on the side of the road changing tires or waiting for a small town tire store to open. We also carried two spares per trailer and some times ran out of tires.
For my trailers with tandem/triaxle 5.2k and 6k axles...or 10k-11k tandem dual axles I use a LT235/85-16" E @ 3042 lbs capacity. Check out the Bridgestone R238 commercial grade all steel ply carcass same as the old tried and true Michelin XPS Ribs. I have poly carcass LT 16" E on my 11400 lb 5th wheel trailer and get in the 50k-55k miles before tread wear bars just start showing.
On other trailers with 7k-8k axles the commercial grade all steel ply carcass Sailun S637 in a ST235/85-16 load G at 4400 lbs capacity. I have a set of these on a 36' triaxle GN stock trailer. Tires have around 35k miles now and going on 7 years old.
Using the tires above we don't have tire problems anymore nor do we need a lot of reserve capacity above the trailers axle ratings as some rv folks tend to do using ST C/D/E tires.