I will get some pics as soon as i can. Its been a little crazy around here. Im hoping to get back to work on it tomorrow night.
I mounted them right along the rear seat. It worked out perfect with the vantage seat sitting on the deck.
To support the front of the seat I just ran a cam buckle strap from rail to rail. I am around 150lbs (not sure if it would work for a heavy wieght)
The rails give some added security, an oh sh@# handle
Rick
Did you ever mount the h-rail to your tandem? I'm especially interested in whether you mounted them by the forward seat and, if so, how you did it. Pictures would be great!