I have been running Carlisle "E"s on my 31 for 4 seasons (4K-5K miles/season). I have had zero issues with them! I inflate them (or deflate them) to exactly 80 psi cold every time I leave home.
2 other AS buddies have the same tire, one is a wide body 30 limited and the other is a 70's 31 like mine, both travel about the same as I do with zero problems.
The majority (not all) of the tire problems that I have heard about and witnessed have been due to either old (cracked) or UNDER INFLATED tires.
I have never owned GYM's so I can't speak about them.
A quick note: when truckers have tires heating up, they always add more psi to them which will cause them to run cooler.
I am totally baffled as to why anybody would under inflate thier tires!
To 2air's point this issue keeps coming up and people keep spreading the myth about a harsher ride. I have even heard from some here that AS utilized the softer tire rating in thier suspension engineering. That is BUNK! I have never seen any data from AS about this and I doubt that it exists. For many many years AS installed bias ply tires without a word of a harsh ride from owners. If your trailer is properly set up and the axles and shocks are in full working order, there is no harsh ride, and moving up one letter in side wall rating will have no ill effects IF everything else is right.
Operation "Save Rudy" Strike Team (charter member)
Yes, I am still working on it.