We used those back in Novemeber of '07. Pictures in this thread
I've always found quads are just too stiff in a 3 foot high wake with 2 foot of run. The pivots didn't provide any change in that "feel" and did slightly diminish drive in comparison to other trailers.
I think I hacked the base off to use them as a canard fin in a twinzer. You should be able to get just the trailers if you call Futures. < drive is due to more vertical and less depth. I hear you on personal taste, if the quad is what works for you, then that's your stick.
3/4. For general info, on Future's fins: all rail fins are 3/4 depth and the thruster trailers are 1/2 depth. With quads, the trailers can be ordered in 1/2 or 3/4. Canards for Twinzer's or the Rusty C-5's use a special C-5 box. The longboard center fins use a separate box altogether.
Yes! and it doesn't work. The notch for the set screw on the 3/4's winds up being at the base of the 1/2's and so there's nothing for the set screw to grab. My incredible artistic talent Quick visual of the issue.