The Rough Country 2.5"-3" leveling kit will level your Toyota Tundra without affecting the ride. This kit includes upper strut extensions and 0.25" spacer shims that can be used in conjunction to the strut spacers to level your stance.
Each shim provides roughly 3/8" of lift. Use both for a full 3" level, or fewer to leave a little rake in the front end angle - a nice option for individuals who prefer a slight nose down look for an aggressive head-on view, or routinely pull trailers and haul items that would potentially draw the nose up from a full level stance.
View leveling kit installation instructions