Im gonna cut the whole thing out, then weld the tube in. Depending on how that extra bottom plate thing looks i will bend that up and add to it, connecting it to the bottom of the 2x4. So i will have a skid from the rockers, down the the frame.
I may use this time to just tie them straight to the frame as well. Still undecided on that. Was thinking a few pieces of 2x2. Ive seen others do it but not sure the stress it would cause only having the rockers hard mounted to frame and nothing else. Could always tie my cage in though