When/how/why max tire pressures raised from 35 PSI to 44 PSI?

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I agree Rusty....I have E load rating on my truck also which are 10 ply and call for a max of 80 lbs....I have them on my truck because I haul 6 ton of coal every year for myself....not all in one trip of course......but I have had 2800 lbs. on already in my ram 1500 and those tire sidewalls barely squat.....Although the leaf springs were bottomed out......hahahah.....only going about 3 miles from the coal breaker though so no harm......great living in coal country when you burn coal

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