Just spend the extra few bucks on a Commercial Truck GPS. I have a Rand McNally OverDryve 8 and a Garmin DEZL 780 for backup that we use in our truck. Either one can be used in auto mode so you can use it in your car too. Lots of extra features also. But know in advance, like all GPS's they're not infallible.
There is an app called Truck Book that I have on my phone but I only used it once.
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2010 FZ 405
2011 F350 6.7 Dually w/Banks Power making 510 hp and 1065 ft/lbs torque
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