My E-350 has a RAWR of 7,800# and my tires are rated at 2,680 max. Since I will not be pushing the RAWR any further these E rated tires have more than enough capacity. I do bump the rear psi to 75 {from medium load of 65 psi} when running heavy and/or towing my bike and trailer {2,220#}.
Running heavy I put 65 in the fronts and medium load bump that down to 60. Also, when towing I air up my rear air bags to 50 psi to help compensate for the tongue weight {it is a single axle trailer}. The ride in either configuration is smooth and steady and passing tracks are hardly noticeable.
Works for me.
:C
