what is the ground pressure of a truck to the ground?

[erici]

so it is the force divided by area? [(mg)/area]
and area is the the corners of all tires and just multiply their lengths?
so a dummy example;(tell me if i'm doing this right?)
calculate a vehicle that is 6000lb and its width is 15ft and length 20ft.
mg=6000lb

area=(15*20)
6000/(15*20)??

[IrvS]

Divide the weight of the truck by the 'footprint' area of all the tires.
(In practice, different wheels will commonly bear different weights,
but with the question as given that's the best you can do.)