My TJ is running a modified "Dave's Rack" that I bought used from a friend's dad. It's for a normal TJ, but I cut the back down bars that went behind the body next to the taillights and have it mounted to angle that bolts to the bed rails on my extended TJ. The whole flip back thingy is kinda a big gimmick IMO, and the knuckle is pretty rattle prone... Too many bolted connections, and I have rewelded both windshield tubes where they cracked almost completely in two at the weld to the mounting plates. I don't think the rack ever did much hauling before me, so that's not so sweet.
I think you need to go almost fully welded if you want a really sturdy rack what doesn't rattle... Could weld the Smittybuilt one, or the similar one by BodyArmor. I think they all howl at higher speeds... Just the nature of the beast. Might be quieter if they're closer to roof height, or have a removable basket. ??
I do appreciate all the feedback in this thread, as I'm thinking it's time to replace my tired rack with something a little more sturdy. Having a jeep that's 5" longer than an unlimited worked well enough until I got a dog, and then a girlfriend... with a bigger dog. Now we have a jeep full of dogs, and a rack full of camping gear... But I wouldn't trade any of them anything!
From a trip to the Snowies in August:
Click on this one for short video...