I've never found length to be a problem.
Height for tunnels and overpasses
Weight for restricted bridges and overpasses
ROAD CONDITIONS which Google knows slightly more about than RV GPSs.
We've been down some ruuuuuf roads in them parts of the woods approved by my RV GPS.
All the up to Asheville is ridiculous.
Here's RV Trip Wizard's take on the route, 3 hours 32 minutes: