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Now yes the drop down brackets do keep the track width to factory spec but they also raise the roll center as they move the pivots 6" lower then where they are with a bent beam kit.
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That statement is fundamentally incorrect.
The drop bracket maintain the stock roll center, it does not raise it, as the instant centers are in the exact same location as stock (as measured from the ground, as all kinematics should be). Bending the I-beams raises the FVSA (front view swing arm) instant centers, and therefore also raises the roll center.
For the rest of the audience... Why does the roll center matter?
The higher the roll center, the smaller the rolling the rolling moment is about the roll center. In other words, the higher roll center inherently resits roll, so that the springs (incl. sway bar) do not have to. In other words, assuming an identical spring setup, the vehicle with the higher roll center will exhibit less body roll.
Good, right? Well, not all the time. In both setups, the "non-rolling overturning moment" is the same, which means both will roll just as easy, but in an extreme case of "jacking" (such as with a roll center near or at the vehicle cG) the driver will get no warning that vehicle is about to flip. Every road vehicle sold in the US today has a roll center low enough to exhibit body body roll before rollover occurs.
Race trucks are different, mostly because the driver's are trained drive those trucks, and also when off-pavement there is rarely enough lateral traction to cause rollover even with high amounts of jacking present.
The M151 Jeep was notorious for unexpected rollovers, largely because it's IFS had a high roll center.
So in a nutshell... A raised roll center may not be bad, as long as the cG is also raised, and the driver understands the limitation of the vehicle, but may not be as on pavement in some situations.
Now... for my take on bending the I-beams.
I think this borders on irresponsible. Please correct me if I am wrong, but I don't believe Camburg heat treats the I-beams after bending? Without the additional step, the forged I-beams lose strength. Just because a Camburg van hasn't broken one yet, doesn't mean it won't happen. If I were to buy bent i-beams, I would sure like to the all the FEA and destructive testing analysis performed on their I-beams before I'd trust them on my vehicles.