Coilover support bars, how much interest?

Seen this discussed some where a while back. One of the things that was mentioned was that there is a chance that the frame rails might roll towards each other over time as there is not much there to stop them. Bars tied into a cage & attached to the upper shock mount were a better solution....from what I remember. How about something like Magnumforce Racing offers except mounted under the inner fenders instead of in the engine compartment? Pretty much what you would do if you had a full cage with snout bars, except instead of being welded to a cage there would be a plate on the firewall?? Now that I am thinking about this I think it was on the BigBlockDart site a few years back....I know in the off road world a support between the two shock hoops is often used to prevent problems....A buddy built this.....