That is completely false. LT tire have higher internal friction and will generate much more heat if you run P metric pressures in an LT tire. The load carrying ability of an LT is LOWER than a P metric at low P metric pressures, and tire failure or blowouts are possible. There are tables to...
I assume your Michelins are P rated as opposed to LT rated tires. Ko2’s are all LT rated which means higher required air pressure and significantly more weight per tire. This means worse braking, acceleration, and mpg. The higher required psi means a much harsher ride than a P rated tire as...