On my Stealth we run the adjustable traps for the crew. I use a dogbone that gives me a simple high/low setting. The benefit of the crew having the adjustables is that he/she can always set to the optimum position no matter where along the boat he/she is trapezing. In addition he/she can get below or above my eyeline so that I can see where to steer!!

PS We use the RWO racing clamcleat system