I bought mine 3 months ago at Ross downing in Hammond ,I had the same issue as you at 70 mph it was extreme vibration,long story short I took it to them and they did a force balance on the tires,I have no idea what force balance is but they told me a lot of the 20" tires are having that problem,that was a month ago and mine is still driving great no vibration at all ,hope this helps
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