Check the engine oil, sup transmission oil and differentials. It wouldn’t hurt to check the brake fluid and coolant also.
Asked to take it for a ride before signing and see if it well shift into two lock, four-wheel-drive and front diff lock without too much hesitation.
Then check the front wheel alignment. Most of them are off so bad you don’t even need a tape measure.
Check the front doors and see if they open and close easily. It’s possible they could be out of adjustment enough that they may bump the roll cage when shutting them.
I don’t know how much you want to look into it but my vehicle had loose nuts on the tie rod ends and one seat belt bolt was only finger tight and I had a brake line bolt missing that hold the line to the upper arm.