Hi RonR2440,
READ THIS THREAD before making a decision on tires for your over-loaded rig.
Tire America sells the Nexen Roadian CT8 HL tire with a 3195 pound rating for $134.91 and it has a max tire pressure of 83 psi, just 3 pounds over the rating of the E450 steel wheel. I would think that is within the margin of safety.
The General Grabber HD for $190.99 has a 90 psi max which is uncomfortable.
CLICK HERE to read the specs on the Nexen tire on Tire Rack's website. The price at Tire Rack is higher, but shipping is free and state sales taxes are not taken out either, so the end price might be the same.
Ron Dittmer