More specific details would help. Is this the TRX400FA, also known as the Rancher 400AT? And not the 400EX sport. I'm assuming it's the Rancher AT because it has an odometer.
If so, I wouldn't pay nearly that for it. I've had mine since they first came out in July of 2003. Just about any other used Honda utility would be much more worth your hard earned cash. And if you want to run big tires, definitely run away. Many here could go on and on about why to avoid spending that much on this model. I'd buy one if it were half the price, but that's cause I understand the workarounds for its quirks and for my uses I don't need to push its limits.