I got my LC with PP with 18 inch wheels from Hansel in Petaluma and they had a few more on order with 18's. Added bonus no other options on mine or most of what they are getting.
Premium LC gets 20" wheels as standard here in oz - probably because they tend to be drive around town cars, drop the kids off for sport not really for 4 wheel driving, it doesn't even have a rear locker. They dedicated a model to 4 wheel driving calling it the Altitude which comes with 18" alloys, suspension disconnect etc.
Mine has 18" rims as well, and I paid 3K less than sticker (for that reason I think) but I liked the fact that it didn't have several K worth of dealer add ons that I didn't want, and the 18s were fine with me. Unfortunately, it was NOT the color I wanted and I regret that decision almost daily as it shows every speak of dust and dirt...................