For my '05, here is the mileage and what was done. All needed doing and none was "preventative". Most all of my miles are highway miles with very little dirt roads.
143,136 miles - Replaced tie-rod ends. New ones are greasable, verses sealed. This should help them last a very long time as I know how to use a grease gun. I recommend greasable over sealed for everything. JMO.
143,207 miles - Replaced both front hub assemblies due to noise. Both assemblies were bad. Wish I could replace with a greasable unit like the second gens. I tore my '99 down and repacked before they needed replacing and never had to replace them. Grease is cheaper than new assemblies (about $800 cheaper).