The WestLake Super ST tires are standard on Grand Design RVs (Solitude, Reflection, Momentum, etc.). The 16" load range E set that came on our fifth wheel served us well until a large bolt or piece of rebar took one out and another had unusual wear from axle alignment issues. I would have used them until they either aged out or wore out had two of them not needed replacement, anyway. As I had planned to do, I replaced them with Sailun load range G tires a couple of months ago. You will read failure stories about any Chinese-made trailer tire (and all but a very few ST tires are made in China these days), but the WestLakes seem to be a cut above most.
Rob