Your going to have to cross the mountains at some point and there some bodacious elevations on I-68 around Frostburg, Friendsville and into to West Virginia where I live. Just travelled I-64 from Lexington to Charleston on return trip to Texasin our 17 ACE and that stretch is just hilly and no big deal. Since you live in the DC area, is it worth considering taking I-66 to I-81S to I-64? Have a great and safe trip regardless of the route you choose.
__________________
|