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I didn't want to get all technical, but read below.
Five quick runs up a 12% grade at 100°f Temps aren't reality.
Weight limits are equally realityless.
I'm not telling you overload your rig or your towing. I'm telling you to apply some reality to the situation and understand:
There are far better things to worry about than worrying of being 3% overweight, even if you're pulling a 12% grade five quick times in 100° heat with the only ramifications being a hot light coming on....
(there might be a clue here as to the proclaimed 300,000 tow rating of an electric truck... Frames is frames, welds is welds)
Just like speed limits, most (dare said:All) weights and measures of mechanical or manufactured devices are set so the most inane fool in the entire universe can't hurt themselves.
SAE J2807 recommended practices will include five areas of testing: structure, propulsion, thermal, handling, and braking. The structure tests validate body, bumper, and frame strength and the hitch itself. The propulsion tests include: launching five times in five minutes, in forward and reverse, on a (very steep) 12-percent grade; zero to 30, zero-to-60, and 40-60-mph level-road acceleration tests; and minimum speed on the Davis Dam grade.
The thermal test, which is part of the long, grueling Davis Dam gradeability exercise, requires no loss of fluids and no warning alerts that would require customer action--and it must be done at 100 degrees F or hotter. The handling tests require sufficient trailer-sway damping and stability enhancing tow vehicle understeer with weight-carrying and weight-distributing hitch setups. The brake tests specify a maximum stopping distance from 20 mph (from federal regulations) and both uphill and downhill park-brake performance on a 12-percent grade.
Someone else might look up and post the reason tire weights are written as they are. They are equal to the tow/weight/load limit capacity testing shown above.
I know I can't put the mind at rest of some. But I can try to make sure some people are enlightened a bit.
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