I had the Warn tire carrier on my 00 XJ. While I wish it was a little more svelte and matched the body lines of 97+ better, it is super beefy, took a lot of abuse, and never rattled.
That said, if you wheel (think more crawl than forest roads) at all I HIGHLY recommend going above and beyond most manufacturers attachment points. The bumper needs to tie into the unibody rails and if the Jeep sees a lot of use, a nut strip is not sufficient tie-in based on my use. If you hit the bumper on rocks, add additional weight for High Lift/Rotopax, the unibody attachment points will warp, crack, and/or tear. After several years of use, I developed hairline cracks on the vertical attachment points on the outer holes and this eventually even stressed the metal where the nut strips attached into the unibody. My bumper sagged. You can see here where we welded the hairline cracks then welded a spacer onto the the bumper attachment points before re-mounting the bumper. The nut strips were re-used but ideally you would fab/use a better tie in to the unibody rail that fill the entire square hole as to prevent vertical movement, if that makes sense. Some quick googling will show you when I mean as it's documented on other forums.
If the Jeep will only see lighter use then maybe a nut strip is sufficient. I still wouldn't add additional weight to the bumper even if it has provisions for lift/gas cans/etc.
