I had the same issue on my 2007. The dealer did the same repair, tie rod ends(had to order the parts also). The service manager gave me the impression that this is normal for these vehicles. I had only about 27000km on this truck at the time and it is only used for commuting, not working or hauling. I said I thought that since it is a truck, it should be built more rugged than this, but he said unless you get an aftermarket set up with grease nipples, the problem will likely recurr. So far I like the vehicle, but some of these little problems are going to be expensive once the warranty is up. I just think that these components on a truck should be designed better than they are. Sorry for the rant!! Good luck,
Mark
BTW, do you have the V6 or V8 and what is your fuel mileage like? (L/100km)