I’ve noticed that 1/2 ton trucks have the same recommended tire pressures front and rear while 3/4 ton and up always have a pressure offset front to rear. Why don’t they run a offset on 1/2 ton trucks...
At the risk of giving 1/2 ton truck owners information they probably don't want to hear, the rear tires aren't inflated much (and generally aren't able to be) because the trucks really can't carry that much weight.
HD trucks and above have payloads that generally start at 2X what a half ton does. As the capacity goes up, the need to carry said capacity goes up and more capable tires (with higher PSI ratings) are needed.