I run E load rated 225x15 trailer tires on my 24 ft Pace car trailer that weighs 8700 lb going down the road loaded. I pull it for 4 to 6 hrs at a time across many local roads and into southern Nevada from here at or above 75 MPH. I believe all the new tires sold here in the U.S. have a speed rating don't they. I probally exceed the speed rating on all my tires, maybe not. I do run them at 85 lbs cold, they have 80 lbs recommended on them. One of the tire suppliers that the company I use to work for recommeded running any tire that was weighing near it's max limit to be ran 5 lbs cold above the max rating on any of the tires he sold, commercial or passenger application He did say that any radial tires that is not worn out in three yeasr to replace it regardless of how much tread was on the tire I haven't had any tire failures, cars, trucks or trailers in the last 5 years , knock on wood I do carry three trailer spares inside