the 06 models are the only ones I have run into with vibration problems
but as far as a single driveshaft it can be done, but you would need a really really good shop to build it for ya, for one thing the lenght, they would have to make sure its very straight and balanced properly, and the balancing would be a serious pain on one that long, but it can be done.
there were a couple people a few years back looking into doing one, mainly dragracing, but figured it wasnt feasable. but heck people are breaking new ground every day on these trucks with new ideas bud, :rock: