I too am considering spacers. I have added the alcan aal's in the back, to bring my springs back from the dead, however, they aren't sagging. Guess I am keeping the 2" lift they said I would get. SO, I want to run the 2" spacers from toytech. I am an IFS Noob though, so I could probably use a volunteer to help with the conversion.
As for durability, this truck is not going to see a tough trail for years. (it is soooo long). I will mainly be doing camping/fishing/Hauling stuff. I can't even see having to replace the idler arm, but I guess I'll do it anyway.
a near-death experience is just god following "catch and release" regulations...
john (johnny) henley