I posted a page from this site in a reply today but feel that it deserves it's own post. Useful site designed for professional tuckers but has a lot of info on a number of aspects relevant to RV trips. I like the page which will give total costs of trip, mileage , routing, fuel prices, truck stops and more. As it's for trucks it should keep one away from low bridges and other restrictions.
TruckMiles.com by ProMiles Software - Free Truck Routing, Maps, Trips, Mileages, (http://www.truckmiles.com/)
Keith
Keith, I feel that is a good web site for truckers who are making their first venture into an area. Most truckers once they have made the trip, they no longer need a map nor map service. I am sure there are many RV types who would get a lot of very valuable info from such a service. Especially for the people who spent the main part of their lives in an office.