Looks to be 03/04, but could easily have swapped out the rims, I changed my 01 rims to 03/04 chromies.
The 03/04 have terribly high rear ends due Ford beefing up the leafs to increase payload.
The rear on that particular truck seems to be lower than your average 03/04. Therefore it could be either 2 things, its a 01/02 model with newer rims or he has installed (or someone did) a set of drop shackles.
Other things to note, if the Eaton blower says Ford SVT beside the snout, it's most likely an 03/04, earlier years (majority at least) has EATON on the blower.
If the rear window surround has a thick black rubber/plastic membrane around it then it is definately an 03/04, 99-02 did not have this piece, Ford added it to fix the leaking window issue.
Ask as many questions as you'd like, this darn truck has been my obsession over the last few years.
It's all about the boost!