Popular in Australia are in-ground trampolines with pit access, many of which have no metal frame on the pit side.
Melbourne, Victoria
At first glance, this looks fantastic. There is now no risk of injury landing on the frame of the tramp while somersaulting into the pit.
But Aussie coaches informed me of a downside.
Since the pit side of the tramp is NOT supported, the bed is SOFT on the pit edge.
All things considered — I still prefer this pit trampoline (made by Acromat over a trampoline with a frame.
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Gymnastics Coaching.com 