i put a factory roof rack from a 97 mazda MPV on my 03 hard top with a sport rack cargo basket w/extension had a good 200-300 lbs of camping gear and had no problems in the summer, now in the winter i dont know if you would really want to put that kind of weight on a fiberglass roof. now i know you can get thule roof racks for jeeps for around $300 for the rack only no basket, but if you go the way i did it only cost me $10 at pick n pull