Highly likely the tires have too much air which will make the truck handle squirelly.
ah64 has the right info. The inflation charts are all pretty much the same for various brands of tires with equal load ratings. Tire mfgs put those charts out for a reason. Vehicle mfgs put recommended pressures on a door sticker for a reason. Race cars adjust tire pressures as little as 1/2 PSI, you can be sure that inflation has a lot to do with how the vehicle handles. Try the door jamb numbers and I bet you will feel like you have a new truck.
