Really need to post some pics.
I think I understand what you are saying, and I think it should work. I would add more bolts if you are counter sinking the heads, as that usually means each is holding on with less material.
IMO, I wouldnt put any on the underside, as they wont help much and would just be more work.
The 3 body mounts are perfect for mounting to. Be sure that you dont connect the rockers directly to the frame, but btwn the tub and the rubber isolaters.
97 TJ, Red, 33" MTR's, Locked F/R, D30/Ford8.8, JKS Disco's, DT3000's, tinted Sailcloth top, 8k Ramsey, Custom bumpers/armor, Ramps 890 on 25degree ramp.
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