I'm still wondering about this question. It looks to me like @primetime4 is right. The ARB slider attaches to the side of the tub with bolts and a backing plate, and attaches to the bottom of the tub with pop rivets. It doesn't seem to have any tie-ins to the body mounts at all.Are you sure about the ARB sliders? I was originally planning to get these due to how they mount with a reinforcement bracket. There are no body mount tie ins. Only rivets from below into the tub.
This install video seemed like a pretty clear illustration of the attachment points:
@JMT, if the ARB slider didn't attach to the body mounts, would that change your opinion of it?