Stock tires 3124

Looking at a 2003 3124ks. Could someone tell me if the original tires are 15"?
The TM is 300 miles away and plan on looking at it this week. Dealer is asking $7000 but I know he will take $7000 out the door. Counter tops are scratch up, easy fix to re-Formica them. Also we're the 2003 frames aluminum or wood.
Tow vehicle is a 2010 Nissan Pathfinder rated at 6000#


Thank you, great site and information, will become a paying member.
Mark