I hear you, going through a similar adjustment going from a 10 foot high bumper pull to a 5er that's 13 ft 3 inches. I bought the Rand McNally app for the Ipad that routes for RVs by entering length, height, width, weight, type, etc.. I also use an app called Allstays Camp and RV that shows low overpasses on the map, along with other important stuff. It doesn't do routing though. I used both on a trip to Florida this month and the only hiccup I encountered was driving through downtown Charleston during rush hour on route 17, which may have been my fault, missed the 17A bypass. So far so good, must stay vigilant