I run 16" LT E on my rv and non rv trailers with 5.2k/6.0k axles that have 6 lug hubs.
On my heavier non rv trailers with 7k axles I use the 16" S637 Sailuns G tires.
The only ST tires on my trailers are the ST235/80-16 E Providers on my favorite 10k gvwr 20' car hauler. The first set ran for 32k-33k miles actual miles and nine years before selling them to a neighbor for his hay rake. Two years now on the same size/load range Providers. I cruise 75 mph (legal speed limit) with my 2500 Dodge/Cummins pulling the same trailer/tractor to job sites sometime 175 miles away.
I became aware of the new gen high speed rating ST E and G Providers in '10 when several haulers forums reported them as OEM on new commercial trailers. I'm sold.