Re: Trailering on Interstates
One thing you may not realize. If your trailer has normal ST trailer tires they are only rated for 65 mph. Many people are blissfully ignorant of this and tow down the road much faster than that.
Many people are blissfully ignorant of the ST trailer tire spec as well.
1) The rating is heat related. Exceeding 65mph for 1/4 mile on a cool day to pass someone is not going to make them explode.
2) ST tires are rated for 65mph AT THEIR MAXIMUM LOAD.
"Based on industry standards, if tires with the ST designation are used at speeds between 66 and 75 mph, it is necessary to increase the cold inflation pressures by 10 psi above the recommended pressure for the load."
So if the tire allows you to inflate by 10 psi above the 'maximum' (like the Goodyear Marathon) or the load/pressure tables for your tire show you can support your actual weight with more than 10psi below the maximum ... then you are good for 75mph. When I replace trailer tires I always go up one size or load rating over stock for this reason.
3) Yeah, a lot of people don't know, don't care, and tow at 80+. How many issues do you think this causes? I've had far more troubles with 2-5 year old valve stems dry rotting and splitting. They then leak air when moving which causes the tires to lose pressure and get hot quickly. I haven't had any actual problems with the tires themselves in the last decade. I've been replacing my trailer tires every six years and the valve stems every three!