I am a High School teacher so I brought my truck in and the Auto class instructor had two of his higher level kids (with his supervision) install my shocks. Great real world experience for them and it was free for me.
Since I didn't pay for the installation, I'm taking it this afternoon for an alignment. The shop I'm taking it to says it might not need it but, I'm having them check it anyway. Better safe than sorry for 45 bucks.
The instructor at my school told me that it might need it and it might not. He said he was sure that it wouldn't be off very bad if at all. If you trust your dealer, then I wouldn't worry about it. Sounds like they've always been straight up with you.
Do you think your truck handles and rides better? I didn't like the way the front end on mine would sway up and down for a second after hitting a bump. The Bilsteins have taken that away and I like it better. Truck seems to stay planted to the road better than before.