The one thought I have is that the long arm suspension has been used on NASCAR cars for years and more recently there is at least one hot rod shop selling a kit to use it under hot rods.
It does have advantages, though I don't know if its the best option for hooking up a pickup. You'll have vitrually no wrap-up unless you install some sort of lowering block.
Isn't the biggest problem getting a pickup to hook up the light weight?