I remember the first time I saw one before I bought mine. I did a double take when I saw a 150 with 7 lugs. The first time I figued it was something cobbed up but watched and saw a few more. Its really not a 150. Just the same sheet metal, just not quite a SD. Since I got mine, I find myself noticing the 7700s on the road. They are rare but easy to spot if you look for them. I think the 7700 option was about an additional 2K when the truck was new. Im sure its more now. As far as Im concerned, money well spent.
Ray
Ray