"Mostly Highway Miles"... That's what *I* was told when I bought MY 1995 eight years ago.
I think people just say that hoping it will calm the buyer
What's he asking for it?? Check it against what edmunds.com and or KBB.com say (I prefer edmunds).
Hopefully he didn't change the oil recently so you can get some idea of it's condition, and make sure he didn't warm it up for ya so you can see how it starts, and how cold the A/C gets (and other stuff).
Do you know what transfer case it has?
Now maybe someone with 97 specific experience will contribute.