To expand on that.... A truck weighing 30Klbs.... with 10 aired down G272s = 1,470 sq in of area. So, we take 30K and divide by the 1,470, and you get 17.2413793103 ... So, ~17 PSI
For contrast, the average human foot exerts ~6-16 PSI depending on standing, running, etc.
Contrast that to 6...