most likely the brackets that ties into the roll cage is a must as Jerry was saying. Did your kit come with spacers for the snubbers? The ones that came with my MORryde were about 1” thick.
The problem is how the rear of the TJ is constructed. The only two things that prevent the top the tail gate opening from closing up or spreading apart are the end of the C pillar being bolted to the top of the inner fender and about 10 or so spot welds below the tail light to the outer face of the torque box for the body mounts. Load the gate and that crap will move since the bracing from the down leg of the C pillar isn't doing that much really. If you want to verify that, it really isn't hard. Go unbolt it, grap aholt with both hands and watch how much effort it takes to slide it over so you can't get the bolts back in. Doesn't really take that much.
