This article is from the Toyota Tundra FAQ, by Steve Yee with numerous contributions by others.
Some owners have warned others about how "thin" Toyota's paint is, especially
in high wear areas such as fender overmolds, etc. This is a common problem
that can be protected using some sort of shield or X-Pel's ScotchCal product.
Other Toyota owners in general have complained about similar problems with
their vehicles. It seems that Toyota is using a thinner base paint of some
sort that is prone to damage.