Welcome to RVF; happy to have you join our merry band or RVers.
Do you need the actual location on the coach, or do you just need the VIN itself? I ask because the VIN will be on the title/registration.
Otherwise, common locations for vehicles of that era are on a small plate at the bottom of the windshield on the driver side (visible from outside the coach), on the steering column near the bottom and on a plate inside the entry door frame.
Good luck.
TJ