the factory nut strip is already installed on the passenger side of the 97+ xj's to hold the exhaust. the bolts are metric and from what i understand, automotive metric is stronger than grade 8 but don't quote me on that. the problem is that the nuts can rust out if there haven't been any bolts in them. when i did my hitch, i bought new nutstrips for each side from the dealer for 25. figured i got the hitch for free and the skid for 30 so it was still dirt cheap. made things super easy and definitely solid. wrestling the hitch and skid into place by myself was enough crap, i didn't want to mess with fishing bolts through although it probably wouldn't have been much more difficult. i just liked the idea of the strips, it's not going anywhere.
heres my class III install with a mini write-up: