None of the gyms I've worked at have had a trampoline set up that was aqeduate for anything beyond front/back tucks really. I probably did the most of any of the recent optionals at my old gym because I hurt my wrist and was pretty limited, and I did back full, front full, but there's really not enough space and then there are walls on two sides. It took me a pretty long time to figure out a method to doing a full without going too close to anything and double full wasn't happening. It's not used beyond special cases like that because there's just not enough space, nowhere for a spotter to stand, and the actual bed is extremely small too. Tumble track, however, is part of the daily rotation and nearly every class. Classes do use the tramp every once in awhile, and so do compulsories for some drills, but it drops off majorly after a certain level. Two other gyms have no tramp (just tumble track) and that is always used. Another gym has a pretty big tramp but it's not in ground and has to be pulled out, also some of the springs aren't covered, so it isn't used for very hard skills (tucks, but only spotted because of the nature of the set up).