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TRD package was also available only on 2WD for 2010 as well. See attached sales brochure on page 6 mentions package. Footnote  on page 13 mentions 2WD only.Don't know how much you trust Wikipedia....
In 2009, subsequent to Toyota releasing the Trail Teams Special Edition FJ Cruiser for the production year of 2008, Toyota created the TRD package. This package was available on FJ Cruisers with the iceberg white monotone exterior color scheme, similar to the 2008 Trail Teams Special Editions, except without the addition of blacked-out trim pieces. Even though this package was known as the "TRD package", it did not include the same or as many features as the TRD Special Edition. Some of the features with this package were the TRD alloy wheels in a silver finish with the BFGoodrich all-terrain tires, as well as TRD logos and graphics on the exterior. Also, the TRD package was only offered on units with two-wheel drive for the 2008 and 2009 model years. Since 2011, Toyota offered the TRD package on the iceberg white FJ Cruisers but opened the package availability to both two- and four-wheel drive models. In 2009, 2,400 units were produced with the TRD package.