I saw the roads; not much danger of overheating tire by high speeds!!
I use the analogy of the balloon -- Take two balloons, blow one up hard and the other soft -- Start poking them with a finger, slowly at first and then quickly to see what it takes to burst each....
You know the best input I got was from the ranchers out here. They pull their cow/horse trailers 60 miles out there one way on rock roads. They all told me that they use bias ply on their trailers and that if they didn't pressure them down it would "shake the beejeezuz" out of their mounts (those tires
are hard!). The good thing too is that they have soo much rubber that folding the sides over to meet the sharp rocks is not a problem either.
Last year the county road grader/scraper got a flat from a knife of football size shale that pierced the sidewall.
If any of you guys ever get out this way I'll give you the latest road scrape schedule and you can pull your trailer all the way to Tuweeep. Everyone should see it at least once.