1/4” tread seems thin but they have a high tread wear rating. Most will age out before wear out.
The thin tread depth is one reason some trailer owners who rack up thousands of miles a year can't afford ST tires.
There better suited for rv trailer owners who run 20k-25k miles in 5 -6 years at the most.
I run 50k-55k miles in seven years with poly carcass LT E tires on my 5th wheel rv trailer. I 'm on the third set installed late last fall. Many 16" LT E tires can have 14 or 15/32 of tread depth so ST E tires doesn't make cents/sense for those of us who run lots of miles per year.
The all steel ply carcass R250 and Xps Ribs have ran 60k-80k miles on commercial class trailers. Both of these tires make better sense for the long haul on a high miles per year rv trailer. Beside they have many years and miles of service records to back them up vs the Endurance that been on the market for 3 years and no miles of service record yet.