Should say one the tire what the max load is and at what PSI. You want that to be more than 1/4 of what the max gvw of your truck is. Or better put, the max load on the tire X 4 should be over the total weight you ever expect your truck to weigh when loaded and even when overloaded.

•1951 GMC 250 in the Project Journals
•1948 Chevrolet 6400 - Detroit Diesel 4-53T - Roadranger 10 speed overdrive - 4 wheel disc brakes
•1952 Chevrolet 3800 pickup
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"First, get a clear notion of what you desire to accomplish, and then in all probability you will succeed in doing it..." -Henry Maudslay-