My goofy buddy loves to overload his vehicles (and trailers.)
Examples
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This trailer tire is NOT under-inflated. It's heavily-loaded.
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He went out-of-his-way to get "1-ton" rear leaf springs installed on his '89 K1500. And thirty- or forty-ply tires, too. Then he expects to inflate the tires to the moon, without ever considering the weight rating of the wheels they're mounted-on, or the weight rating of the 8.5" axle they're bolted-to.
Put enough air pressure in the tire, and hit a big enough bump...and blow the bead-holding side of the wheel into outer space.
OTOH, I was the third person in the cab of an early-'70s half-ton Mopar pickup with a leaning tower of power and 3-speed; traveling ten-ish miles from the mine to his girlfriend's home with a box full of coal. I remember it as 4000 pounds, but it was decades ago, that can't be right. Tires inflated to the max, and still squished flat on the bottom. Springs so flat that the truck rode on the bump-stops. That poor truck was a Dirty Old Dog Goin' East, and it had my total respect.