Is there a GPS navigation system available for RVs, that could be downloaded to a Garmin? We are going from Maine to Missoula Montana later this summer to visit my wife's relatives, and would like to avoid low bridges and dead end roads. Our 36' 5th wheel and a 28' F350 have had a couple of bad situations that our Garmin (with general driving directions for autos) has led us into.
Thanks, Craig