Which rear radius rods makes not a bit of difference in how the chassis rides, except corners are flatter with hair pin type, springs and shocks do that for you and where they are located...
Huummm. in theory that should not be true. due to the geometry of the hairpin style, when used on the rear, if one wheel hits a bump the rear axle can't twist like the front, so some of that energy should be transfered to the other side, ultimatly making the suspension feel stiffer. perhaps much of that energy is absorbed by the hairpins themselves? doesn't seem possible.
Russ