Re: 15" rims on a WK
No the worst that will happen is you might damage the wheels sooner then an small wheel. If you look deep in to off roading and many competition vehicles 17" is the ideal size.
2005 Dark Khaki (PJT) WK Limited 4.7L V8, Suckin Gas!
2006 Jeep Liberty KJ 4x4 2.8L CRD Sips Diesel like well aged Whiskey.