Empty weight: 29,000 lb
Max T.O. weight: 51,000
And for reference, a loaded tractor-trailer has a GVW of well over 80,000 pounds, though that is spread over more wheels.
lets run some numbers
allow an near empty weight of 30,000 pounds / 2 wheels = 15,000 pounds
if the the contact is 6’’ x 6 “ =36 square inches then 15,000/36 = 416 psi
It’s likely more but not a lot more