An 8" trailer tire that is in good condition should have no problem going 1,000 miles at 55 mph. But first you need to make sure the load you're carrying isn't too much for your tires. Be sure you compare the tires "load range," which is the maximum weight they can carry. Also, be sure each tire is inflated to the correct air pressure.
If you aren't sure what the load range is, contact a local tire dealer who carries trailer tires. They should be able to tell you what a safe weight is based on your tires.
〉 Answered on Apr 1st, 2008 by Denise Koeth, Managing Editor at Tire Review Magazine
Some tires do have speed and mileage limitations on them. If you are not sure of your tire ratings, it's best to have a professional look at it. Never take a chance when it comes to tires. This is a big safety concern, not only for you, but all others on the road.
〉 Answered on Apr 1st, 2008 by Suzanne Grego, Technician at City of Philadelphia Fleet Management