I am currently running an under tramp system..... See pic... notice the pink sock stiched under the tramp and the opening at the front port side. The sock is a 49er sock.

We will be very soon, changing to the mid pole system as the tramp system has some disadvantages.

Slower to raise and drop whilst on port - but still possible if you run deeper.

Also you cannot run as hot an angle as those pole systems when rounding the top bouy or approaching the bottom mark.

Whilst setting you have to run a little bit deeper and the pole snuffers just role over the top of you.