Just N. of Kingsport is Natural Tunnel State Park 
in Va.  (Do not confuse this with Natural Bridge, 
VA)  I can't quite remember how far from I-81, 
maybe 30-40 minutes?  Nice little campground, 
make sure it's not full.  Very nice bath house I 
remember...  The natural tunnel is very dramatic 
bare rock scenery, reminded me of a tiny Yosemite 
if you can believe that.  It's a small park and 
not a ton of stuff to do and see there, but you don't have much time either.

As David Clarkson mentions, the Mt. Rogers Rec 
Area is beautiful but I think you'll be getting a 
ways from I-81 if you go very far in there.  US 
58 is quite winding and slow.  Oh, I see the Bear 
Tree Campground is only about 18 miles from 
I-81.  I have stayed there.  It is a National 
Park type campground, can't remember if it had hot showers etc...

I have also Wal-mart camped at the ones in 
Bristol and Wytheville, both very close to I-81 
but sounds like you want a real campground, not 
stealth.  And here I can plug my latest find in 
that 
area:  http://rec.wytheville.org/aquatics.php 
the Wytheville Community Center.  Big fancy pool 
complex with mini water park, whirlpool, 
etc.  Nice locker rooms, lots of exercise 
equipment, pretty lengthy hours of operation. You can go on a $6 one day pass.

Have Fun,
Edward

At 04:35 PM 10/7/2010, David Wilhite wrote:
>All,
>
>
>
>My family will� be traveling in our Westy to 
>visit relatives in northern VA and will be 
>traveling� along I81 from TN and was wondering 
>if anyone would have a recommendation for an 
>overnight camp spot along I81.�  Ideally, it 
>would be between Kingsport, TN and Roanoke, VA 
>which is around our halfway point.�  Someplace 
>inexpensive where we can pull in, pop the top 
>and get some sleep.�  Not looking to do a full 
>camp out, since we don't have the space for all 
>the stuff to carry (there are 5 of us), but 
>might consider someplace that has some nice 
>stuff to see during the morning hours.
>
>
>
>Thanks,
>
>David Wilhite
>
>84' Westy Middle TN