Why not just make it solid but reverseable
If it was solid, to flip it you would have to unload the bikes, flip it, then reload the bikes. By having it pivot, it is remove one end of the bar, rotate in new position, and reinstall the bar. I figure I can go from low to high in under 60 seconds.
Since it is so easy to do, it will be very practical to leave in the down position most of the time and only raise it when needed. In the down position, I will just be able to see the handle bars so there isn't any interference with my view.