What is wrong with my F150

I'm not sure what mileage was on the truck when the Chinese tires got the last set of Michelins, which were the second set of tires on it. The second set of Michelins have been on it since 07. There is 174,000 miles on it. The tires have most of the tread. One problem I encountered was the insistence of the Folks that change the oil to set the tire pressure at 32 lbs. The Hancocks, that came on it didn't last long. I don't know what the pressure on the door sticker says but the Michelins run at 45lbs max and can be run ten percent over, on a light truck tire. I have to reset the pressure to 40 lbs, despite me telling them what to set them at. They say they have to set according to the sticker. Some people are so maddening. At 32 lbs the truck is somewhat squirrley, especially in curves. If I carry a load they go to 45 lbs.
Some Michelins in larger sizes run to 80 lbs for light truck tires. I feel really that the tires should be run at 45 lbs. The truck rarely sees any- speed though.