I use CoPilot RV app - uses phone's GPS so works even if you don't have cell service. Has campgrounds, fuel stops, Walmarts, restaurants, etc. For subscription they also have live traffic. Been using it for a couple of years and happy with it. I do always double check the route on an Atlas or use Google Maps on my laptop to see if there are alternate routes that look better. I do the initial planning on laptop then input the info into CoPilot.
Lonny & Diane
2004 Country Coach Allure 33' "Big Blue"
Towing 2008 Chev Colorado 4x4
Semper Fi