Gettin' building on it as we speak. I have a mod thread around here somewhere, it may be of use to you.
The sheer volume of the truck makes for a great starting place, stable and capable platform. IMHO it needs a few mods here and there to do the really rough stuff with a full load, but as an overland vehicle it doesn't take much to make it a comfortable vehicle to live out of for a week or two at a time.
Take a look at the ExPo Frontier build on the main page, it's almost exactly the same size.
My truck went on a diet, got some Rhino and Herculiner in strategic locations (like the interior and the roof), a few capability mods, a simple system for storing water, fuel, tools and camping gear...it works great.
Some tips, there are a lot of empty spaces on the truck, and a 35" tire apparently does fit in the spare tire location, or can be made to fit...it's a little over 35" between the frame rails. There's a generous amount of room in the bedsides, a huge amount of space if you remove the rear seat, cavities in the captain's chair backs (each seat in my truck holds a 2.5g Dromedary bag with a drinking hose), space under the seats...
If you move the spare tire to the bed, there's plenty of room to relocate a pair of batteries to the rear, as well as store an auxiliary fuel tank in the original spare location--the tire is lighter. Blue tupperware "rougheck" bins are a great fit in the bed and in the back seat.
The available space really lends itself to packing everything you need and still having space left for toys, without the need for a trailer.
Also, in a blatant plug for the Overland Journal, there's an ad showing a Tundra with a flip tent in the latest issue

.
-Sean