The brackets on each side of the liberty is for mounting a step bar, tube bar, etc... I just took my tubular mopar bars off the Jeep and those were the last things I removed.
You need a deep socket to get them off, size 15mm. Once you remove the nuts you will have to play "puzzle time" to get the u-bolt off. They are not individual bolts, rather a piece that snakes it way into the axle and back out the other end. Just like our famous front end tow hook bolt. I'm rambling on because I don't even know what they are called and I will shut up now
