Hey guys I'm gonna be making a trip to Charlotte N.C. and from there to Greenville S.C. towards the end of July. Will be pulling 30ft enclosed gooseneck trailer, combined weight of 19,800 lbs. I plan on running as much interstate as I can, what kind of grades will I be seeing and will I be traveling through alot of mountains and such, or lots of highway construction? I just finished a trip from Indy to Atlanta, and then to Layafette Louisiana and back through Nashville. Big ol' cummins is managing to get an average of 11.8 mpgs at that weight while running about 70-75 mph. Any suggested routes or places that one should see on the way through those areas. Thanks for any input and advice thanks.