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Welcome, I'm Chris (aka Moose).
Is this a really bad vibration like dangerous or more subtle that tickles?
I doubt I could diagnose any better over a phone.
Since the concern is almost gone below 60 and bad around 70. It is for sure something spinning either out of ba***** *****ke a wheel weight that has come off. A concern with worn or damaged suspension and steering components causing an alignment concern like incorrect toe setting. See if the tires are wearing uneven or if the tire treads are feathered. The alignment is to blame if so. I would suggest you drive at a safe speed to aplace that can check it over and or ride with you to experience this.
Now that I have posted a partial or complete answer, you will see you can rate me. The deposit you have already paid is not transferred to me until you rate me. I would like to receive nothing less than 5 star excellent ratings. So if we are not there yet, please reply and let me help more. If you're not pleased, let me know because rating bad does not result in a refund, there are better options. Rating now will not close this post nor prevent replying. Thanks Chris
Yes a tire store could at least give you a visual inspection. Also a tractor trailer repair site near the interstate could. Used one myself today. We towed my travel trailer in TN. I had a belt pulley fail. I had bought the pulley at a parts store but needed a long 1/2 ratchet to loosen the tensioner. A semi shop let me borrow there tool and I did the repair in there parking lot.
Hello Chris here again,
I am checking in to make sure you got everything you expected from my answer. The option to rate my response or reply is still available. I want to make sure you were pleased with what you paid for.