Hey, i just read that its a 2002. Unless you know the service history, changing all fluids would be advisable regardless of your last experiences.
When ever i buy used, i do all the fluids as soon as i get the vehicle. This includes a Toy diesel truck, Mits Pajero, Skyline, Dodge Ram.
The only one id did not do was the 77 jeep (except for oil change) as the owber had a detailed book on everything he did. He was very meticulous and trustworthy.