Johnd. What brand are your "hi run ST's
Hi Run is the brand name.
I actually bought them as a set of five including wheels from a utility trailer builder here in Denver when we had them replace both axles and all of the springs on our previous Heartland Trail Runner.
One week after we got the trailer back while we were at a Colorado HOC campout about 15 miles from home we traded in that trailer for our new Prowler and I had them swap out the Hi Runs for the TowMax (AKA - BlowMax) tires that came from the factory on the Prowler.
We've been on nine campouts so far, including a trip to Tucson, AZ (HOC Rodeo Rally), and will be leaving day after tomorrow for the Colorado HOC Rally in Colorado Springs, CO, and then in three weeks we'll be heading out to the Vegas Rally!
They are 225/75/15 load range D or E (I'll have to double check the load range but are the same as the tires that came on it from the factory), but after roughly 4000 miles they still look like new.