I use a Lenovo Tab 8 that's a couple years old with no problem, although Gaia does suck up a good amount of memory if you download a lot of maps. I think I have 64G in there and it's almost all used up. I don't think Lenovo makes those anymore but if you're only using it for Gaia I'd just get a inexpensive Android tablet and go from there. FWIW as said above Gaia does run better and have better features in IOS.
As far as GPS in a phone or tablet goes I wouldn't rely on that. Phones and tablets use AGPS as opposed to GPS. You can research the differences but basically the phones and tablets are relying on additional location services being provided by other nearby devices in addition to any satellite it can find. If there is no signal you're screwed. I tried this for a while and had bad luck with loosing satellite signals. Also, with AGPS location is not very accurate. Maybe +- 10m. If you get an independent GPS receiver accuracy would be closer to +-1m. As well with an independent GPS receiver you can get multiple GPS satellites and GLONAS satellites (Russian GPS). I typically see signals from 6-12 satellites even in very remote areas. Three signals are required for accurate positioning including altitude. Also, with your tablet in a usable location in the rig the GPS receiver will have limited low angle view of the open sky making it difficult to get a good signal, let alone three. With an independent unit you can place it either on your dash or some can be mounted on your roof.
I have used one of these for a couple years with good luck. It will connect to iPhone, Android or a laptop/computer with the correct app installed. In order for it to work you shut off the location services on the device. It's also small, rechargeable and portable so can be used for back packing or transferred between vehicles
https://www.amazon.com/Dual-Electro...ocphy=9028767&hvtargid=pla-441061981403&psc=1