If you are not building them, I went with ajsoffroad and do not regret it at all 5 years later. Some friends also have great things to say about the JCR's.
Most of the ones available bolt to the uniframe, have a bolt in the rear leaf mounting box and have bolts attaching along the pinch seam. This is pretty sturdy for your average and even pretty hard rock bashing. If you hit them reeeally hard repeatedly, you'll want to do some fabbing to integrate them further eventually.