Bash, I think there is a problem with the electronics in the rear of the 06 getting in the way of the V2 Bushtec, but have not crawled under one to see. I looked at Bushtecs instructions, and they said 'all years'. but the revision date was 2003.
I believe there was a small change in the frame on the 05 model. Something about a slight bend someplace to give more clearance from the exhaust on one side. I tried to get a Hitch Dr for my 05 back in early 05 and they told me they had not made the change for the 05 yet. I went with a Bushtec. Therefore I would be a little cautious about trying to fit an 02 hitch on any year after 04. A call to Bushtec should give you the answer.
I just installed a Bushtec on my 06 but I bought in new from them. Looking at the instructions I think they made a few changes for the 06. The reinforcing bars that come down from under the seat have about a 90 degree bend in them and the picture only shows one. I would suggest calling Bushtec they could tell you. They might even send or sell you the new parts. Good Luck!