Tire manufactures pay a lot of money to test car tires under many different conditions. Speed ratings and safety factors are much better. ST tires are rated for 65MPH max and if it is hot outside you better lower that some more. Very rarely do you see a car tire come apart unless it was run at high speeds with almost no air. I have had flats but never a blow out on a car or truck.
An added benefit to car tires is that they ride smoother and they won't shake your trailer apart. Stiff sidewalls are not needed since the Airstreams have a low center of gravity closer to that of a car.
Perry
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