We've full-timed and mainly traveled in the West for 16 years. We rarely drove the interstates with our 40' motorhome towing the Jeep. We love mountain driving and secondary roads. We've never had an issue. We look at maps and don't rely on a GPS. Good maps will give you tunnels and if you want to study further, Google the highway. State highways are normally traveled by semis. Forest service roads were traveled with our Jeep for exploring after parking the RV.