I have the nice 15X7 honeycomb factory alloys on my current Troop (Ebay specials), but have run aftermarket chrome wheels in the past that were not Hub-Centric; they just aligned on the lug nuts. Had no problems with them.
4"-5" past the fenderwells sounds like an awful lot of offset, it might put a lot of stress on the suspension parts.
Best thing to do, if you can bring a jack and lug nut wrench, is to remove the front wheel and do a test fitment.
Better than wasting $$$ on wheels that won't work.
BTW, the black Wagon Wheels are quite popular with the Off-road bunch, aren't too expensive, and are pretty strong. 15X7 is a good size for up to 31" tires, you might go wider with larger rubber.
'90 3.4 Troop LS;
'89 Troop RS (Exhaust Valve Challenged), now gone to a Good Home!
Yes, I am a Trooper-Holic!!!
Keep On Troopin' !