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There are a number of other threads you can search on using Goodyear or marathon or tire failure as search terms... This is not a new issue or subject...
Here is the deal...
1. ANY "ST" rated (Special Trailer") rated tire will max out at 65 mph and 100 degrees... That is all the tire companies feel they need to be designed for.
2. You can run anything you want on your trailer, from LT tires to 20" rims and little skinny donut tires. Your mileage may vary.. LT Tires are stiffer, and will cause a rough ride for trailer and contents, though many are designed for higher speeds and temps and load.
3. I know of few states that have speed limits of 70 or 75 mph for trucks and cars towing trailers.. Most speed limit signs have fine print at bottom limiting these two groups to 10 mph less than the autos... Many members (according to poll data) feel OK going faster, but the speed limits don't reflect that.
4. If blowouts and failures seem inevitable, I'm thinking a few less mph would make the inevitable event less exciting and easier to recover from..
Having experienced my first last month, my new learning is to carry a spare mounted, even if it has to go inside tow vehicle... Emergency Road Service can't help you on a Sunday eve when nearest tire stores are closed, and you might not enjoy spending the night where the tire failed, as they recommended that I should do...
John McG
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Condoluminum
In Theory, there's no difference between Theory and Practice, but in Practice, there is usually a difference... 
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