i was searching for a tramp gym to practice at this summer and i found a really dope place in grand rapids. its a 2 hour drive for me from southeast michigan but i think its worth it. http://www.abgym.net/Welcome.html
they have a super tramp which can be found at woodward in tahoe and copper. https://www.youtube.com/watch?v=TXktH5woS1w
heres an edit of henrik sammy and tanner seshing on the same tramp they have at the gym.