Been I-26 many times. There are 2 climbs going from Asheville NC to the TN line south of Johnson City. Its only a 6 % mostly with about a mile or so of 7%, I dont think you would have any problem, It is a beautiful drive, and easy drive around Asheville. The other way which would be longer, is go I-26 to I-40 west to I-81, which will be about 65 miles to I-81, then north on I-81 right into Bristol Tn. which will be about 75 miles there about. I have been both routes serveral times. I-26 is alot closer.
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