Another vote for the Dezl 760 (Garmin). The Rand McNally version can also be downloaded to an Ipad and run on that. I tried that, to get a feel for how I might like it. Nothing terrible to say about it, but I ended up preferring the Garmin more, so ended up buying it. Garmin perhaps not quite as easy to find campgrounds while on the road - but we have ipads, smart phones and laptops that do a better job than either, anyway. As with any GPS, you can't trust it 100%. You always have to preview the suggested route, and verify separately. It wanted to send us on some very strange routes due to perceived areas that were not allowable for trucks. But so did the Rand software.
I REALLY like the lane assist - it tells you way in advance what lane to be in for navigating freeway interchanges. A live saver in navigating Chicago in our 5th!
2012 Ford F-150 Eco, Max/Max
Jayco 26.5 RLS, Reese Sidewinder