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Get an RV GPS along with an expensive atlas (like GoodSam's or the Truckers Atlas). Something like a Garmin RV890. I doubt you will find any smartphone app that can compete with the Garmin RV GPS for ease of use, different routing aspects, size of RV, etc.
oh - don't be stingy - you spent 10s of thousands on a truck and trailer, a few hundred dollars more shouldn't break the bank (at least not much more than we're be paying for fuel these days).
Garmin RV GPS while driving. RV Life Trip Wizard for planning. The Mountain Directory (downloadable version) for grades and mountain situations.
Rob
Mountain directory is a good one for folks going to mountain grade country for the first time to get a little heads up before having a white knuckle situation.
Rezvani's Latest Post-Apocalyptic Monster Is a Ford F-150 Raptor Underneath
Slideshow: Called the Fortress, the 850-horsepower pickup combines Raptor underpinnings with military-inspired features, survival equipment, and a starting price of $285,000.