Airbags would help fix the problem but now you are redesigning the suspension. Not a problem with most pickups but by adding them you will limit your suspension travel. Guess if you never take it off road it wouldn't be a problem but why then did you just pay the extra money for a raptor over a regular F150? Again, Ford Racing designed this baby to come as close as you can to an off road racer and still be road legal which does not lend itself to good towing manners. Personally I can't see owning one unless you enjoy off roading (I do).
As for the comments I found, I simply googled and did some reading. I was curious myself on how they did with how they are built. I'm not going to try and dig them all up and provide links.
You already know what you have vs someones other problems and if you replace it with new that is alot of money to spend and lost equity on trading what they have.