After using a few different types ( including paper maps) the Rand McNally (Good Sam) RVGPS has my vote. No fuss no worry plug in your vehicle weight 5vr length and height and choose your destination.
Automatically avoids weight restrictions, height restrictions, roads that where you can't fit, or are not allowed on. Plug in waypoints, track fuel economy, select rest stops, campgrounds, attractions, what ever you like.
Also, for about $20 a year traffic is added. Route around traffic or construction. Up to the minutes traffic updates and weather too.
Updates via the internet or WiFi are free. We like it a lot.
Eric
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