The 7.50R-16 is a narrow tire it runs 110 PSI like I said it will distort your rim before the tire give out. Very tough tires guys run them because they are puncture proof good for offroad.
They are speed rated thou because the heat build up is pretty high.
When your running a duals especially Ford-Chev-Dodge 1 tons you want the tall skinny tires on the back gives you good traction and prevents the tires from floating. Get into mud or snow you have more traction.