I sometimes worry about certain routes, so I use google maps and use the earth feature, then zoom down on parts of the route that might be problematic for rv's. You can also drag the little yellow man figure over the the route to get the same street level view, then move down the route to check the curves and turns, etc. etc.
I still use other folks advice, but doing the map thing sets my mind at ease a bit more.
Tom & Carol
