I wouldn’t but pictures, especially of undercarriage, would be very helpful. For that money I’d be going to a southern state and finding one with no rust. Definitely check frame with a hammer and screwdriver, paying close attention to right front where AC drains and also rear crossmember. Any codes? NAV sucks, you can replace but it’s not cheap, and the best way(sourcing non nav parts) is very expensive, especially for the 2008. Cost me over $1k, absolutely worth it, took 2 years to source parts.
How are headlights, tires, suspension, axles? Dash cracked? Parts add up, even if you do your own work. Unless Gx is pristine I bet you put 2-5k into it first year alone.
Anyway, if I were to buy a northern gx no way I’m paying over 10k, and probably 8k tops for a nice example. Rust sucks, makes all the repairs harder and that I can say this from experience(2008 blue gx from New England).