Here is an update. I took it to another tire shop that has an Elite road force balancer. They checked all 4 tires and found 2 of them needed to be rebalanced and one of which where the tire needed to be twisted on the rim to line up the weight property. I always assumed the tires would come perfectly balanced from the factory, apparently not...
Afterwards, it did help quite a bit with the highway speed vibration, but didn't completely eliminate it. I later saw the tire shop aired the tires up to 44psi so I lowered it back down to 38psi and the ride once again became a little smoother.
Earlier this morning, I had about 200-300 lbs worth of cargo in the truck bed and was driving the same route on the highway as I normally do when I feel the vibration/bounciness the most. Low and behold, the ride was almost night and day smoother. Figures, since trucks are generally smoother with more weight in the bed.
So I decided to pick up four 50lb play sand bags from Home depot and left them in the bed. So far, it seems to help quite a bit. I think I'll leave them back for a while and see how it goes.
As a point of reference when it comes to ride quality, I did have a 2013 Ram1500 Longhorn with the air suspension for a few years, so I guess I was used to something a little smoother.
As funny as it may look, these sand bags do help quite a bit!
