E rated tires do not belong on a half ton. I made the mistake of getting e rated tires on my new 2008 ram 1500. The ride was bad and I realized they sold me e rated tires a few days later. I should have took them back but never did and regretted staying with them for 4 years until I got rid of the truck. The only way to get them to ride good is to drop the pressure to about 30 PSI and that is too low for them. I ran 35 psi and they still rode like ****. I suggest returning the tires and getting the proper D rated tire for your truck.