If your not maxing out your load carrying ability, go to D rated tires. You will have to live with that stupid tpms light on the dash though. I run 40lbs in my d rated tires and it smooths things out a lot. You said you didn't want to change the suspension but a quality shock like the bilstien will go a long way to smooth things out as well.
Few things I don't like, but the constant but slight shimmy on the interstate is a potential deal breaker. I've done new D rated tires, less air, more air, alignment, another alignment. It's both under acceleration and non, so I don't think it's drive line. Even had 500lbs in the bed up against tailgate.
Where to look now?
It's long bed 350. I did not expect it to ride like a Cadillac, but I did expect to talk with out my voice vibrating on the highway.
I feel they are different enough. They are diffident in my mind.
Blah blah blah
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