Here for your viewing pleasure is the same Xterra, on the same loading dock, again in 4x2 and unlocked, but this time with a solid shackle of the exact same length as the closed revolver.

Solid shackle - same ramp

Revolver - same video as page 3

The Revolver let me go an extra 26 inches forward on the loading ramp. This is a gain of 4 inches in vertical travel before the wheel spins. This is real world but under controlled conditions.

Since this is a side by side comparison with all conditions being equal with the exception of the shackle I think it is hard to refute the results.

Both tests were done in 2 wheel drive so you can compare for yourself how the revolver does provide some degree of usefull traction enhancing droop.