I feel compelled to be a voice in favor of a Garmin or dedicated GPS unit. I have found that in ALL of my last 5 trips out I load a certain portion of huge-file topo map tiles for offline use to my tablet setup (Gaia and BT garmin reciever, no data). I usually go far outside the area I think we will be going and will be covered. In every circumstance, plans changed, we found something cool, and we drive outside the map. This renders my slick little tablet useless for its main intended purpose. Still keeps audible books playing, but I am relying on paper navigation at that point or my little Etrex 20 I use for hikes and skiing. It takes a long time to get those map tile files on a tablet, usually at night when I am dragging from a long days work and trying to prep the rig during the week. I'm over it.
I am drooling over the new Garmin and miss my old one. Seems perfect for so many activites and I can load 8 states worth of scale-able, reliable TOPO into the thing and just start driving.