I've been using a Tab Active 2 running Gaia for a couple of years with very good success. I found that the onboard antenna for the GPS was a little weak when it was inside the truck so I added a Garmin GLO 2 Bluetooth GPS antenna and it works much better.
The GLO™ 2 is a GPS and GLONASS receiver that serves up Garmin caliber GPS data on the mobile device of your choice via BlueTooth® wireless technology.
www.garmin.com
I made a little shelf that attaches to the top of the dash on my Defender 90 right at the base of the windshield so that it gets a good look at the sky. On the new 110 I just put the receiver out at the base of the windshield.
A friend of mine uses a 10" Samsung tablet and likes it because our older eyes can see it better - sometimes I think he might have had the better idea.
RAM makes a variety of mounts for tablets:
https://rammount.com/collections/samsung-galaxy-tablet-mounts
My Defender 90 has RAM mount balls all over the interior for a variety of stuff like phone mounts, camera mounts and other stuff - I use a C size ball to mount the tablet.