We get around quite well using a fairly basic Garmin Novi 52 GPS that's a few years old. With lifetime updates, it stays pretty current on routing changes, and the POI (Points Of Interest) files I've added from free online sources alert us to low clearances, upcoming rest areas, fuel stops, etc. Off hand, I don't recall seeing any publicly available navigational aids with "avoid left turns" type of features. "Fastest", "Shortest" type routing is pretty standard, and there are apps and GPS's that will take the height and length of your RV/truck into consideration in routing though.