I want to do this so bad, probably will in a couple years. On my 99 Tacoma, the only thing that wasn't rusted out was the rhino liner in the bed, and it didn't look too weathered after 13 years in the sun. And that was without the UV / clear coat treatment they have for Line-X now.
To all the people worrying about resale - what the hell? Why would you ever think of selling your trucks? Unless Toyota also offers to buy this one back for 75% of its brand-new value in 15 years, I'm keeping mine until it falls apart.