As an alternative to KOA, I found a book on Truck Stops that lists
MANY  truck stops and whether or not RVs are welcome.  I too prefer
'nature' but when just going from point A to point B and I want/need
a shower or a few hours sleep.........

Truckstops:  "A Complete Guide to over 5,000 Truck Stops in the U.S.
& Canada"  Paperback - 375 pages New 1998  edition (January 1998)
Globe Pequot Pr; ISBN: 1880477130 ; Dimensions  (in inches): 0.93 x
10.85 x 8.36

$9.56 at www.amazon.com