According to Google Earth's elevation/grade tool when you get within about 50 miles of Asheville, the elevation rises at a 6% rate over the next 6 miles, from 1100' to around 1900'. It then dips a bit and rises again to 2200'.
Mike. Comments are anecdotal or personal opinions, and worth what you paid for them.
2018 (2017 Sprinter Cab Chassis) Navion24V + 2016 Wrangler JKU (sold @ ????)
2016 Sunstar 26HE, V10, 3V, 6 Speed (sold @ 4600 miles)
2002 Roadtrek C190P (sold @ 315,000kms)