14/16 ply tires are the "exact same tire"?

14 and 16 both have 4 steel plies in tread and 1 steel ply in sidewall. The only difference is the inflation pressure to make the difference in load rating. Cut one open and in sections and it is the same construction.
The same with passenger tires like an Extra Load rated tire like a 235/75R15 XL is just a higher inflation. Usually 41psi from 35psi standard load.

 

He is correct on pressures. Mast, BFS, and GDY all agree on the same industry standard pressure recommendations. That is own reason why you will never find a Penske truck or big fleets with more than 95 psi in a tire.

 

<130 psi load range J steers have joined the chat. >

FET is based on tire weight, IIRC.

Higher pressures yield lower temps at any given load. The manufacturers test at various pressures to see how much load it takes to overheat the tire. That's the numbers in your load charts.

 

Run a 120 psi trailer tire you didnt personally run from brand new, i guarantee you an explosion in june-august. Simple road Heat creates extra pressure, thats why i prefer 100 max drives and back even if i HAVE run from brand new, even at the cost of a little mpg

 

Problem with running the minimum air pressure is tires slowly lose pressure and if not checked often it’s now under inflated. The extra 15 psi cushion could save a failed dot inspection.

 

I wasn't saying to max out the pressure, but merely pointing out how the load charts are determined.

But any tire casing runs cooler at higher pressures, there's less flex to generate heat. Running a much higher pressure than needed can cause other tread-related problems , but the casing itself benefits from minimum heat generation.

Your example of a second hand tire casing failure is almost certainly a tire that was run low at some point in its life, weakening the belts so they could no longer handle pressures above the max cold pressure of the casing.

 

Chart, Chart, Whose Got the Chart?

 

It’s hard to explain but heat generated pressure is much higher in a tire that is overheated by overloading and flex stressing of the sidewall and bead bundle then ambient, direct sunlight, or road surface heat can produce. We’ve gone through numerous testing seminar's both live at proving grounds and classroom video conference that show what heat will do with psi.
A tire maxed on weight but running 100 vs 105 could be running 60 degrees hotter in same climate and road conditions due to flex. This is why in the early 2000’s they raised max psi from 100 to 105 when the truck speed limits were raised.
They did same with Passenger tires and raised psi’s on many of them from 35 to 44 when states rolled out the 70 speed limits.

 

He is full of ####. They are not the same tire
As far as weight ratings. As you already know this

 

Something else to keep in mind also is most wheels are only rated at 120 psi max and around 7200 lbs load. So a LRH “16 ply” is pushing the capacity of the wheel it is mounted on.
Like @Hammer166 stated the new LRJ’s “18 ply” are going to need wheel manufactures to update ratings before they can become mainstream. Not going to happen anytime soon because the industry as a whole is looking toward the EV change and that means different wheels and tires entirely.
Just ask the Tesla crowd how much their stuff costs to replace and how long they last.