There is a RV route type at the top of the “Route” screen. You will see three options: Driving (Car icon), RV Routing (Motorhome icon), and Walking (Pedestrian icon). Once RV Routing is selected, an “RV Route Profile” option will appear where you can input your RV’s description*. Routes will then avoid known clearance/weight restrictions.
*For vehicles towing a trailer, the dimensions and weight are for the combined vehicle and trailer.