Source: https://en.wikipedia.org/wiki/Tire_codeI didn't know a truck like that could physically do that on a single set of tires.
LT235/85R16 2623 @65 3042 @80
An E rated tire at 80 PSI can carry just over 3000#. Again - this is not condoning unsafe practices, but simply pointing out that there are light truck tires that can carry the kinds of loads being referenced.