I have a 20' Rave water trampoline. I went to home depot and got one of those large, heavy duty plastic storage bins, 3-4 bags of quickcrete, a string of rebar and a 3' section of heavy chain. Fill the bin with the concrete 1/2 way up, lay the rebar horizontally across the quickcrete with one link of chain around the rebar and the rest hold up above the bin. Then fill the rest of the bin with quickcrete enveloping the rebar and the bottom several links of chain. it will weigh a lot and be a permanent anchor. You may want a string and bouy ball on the end of the chain as taking the anchor in/out of the water will not be easy given the weigh but it should hold well.
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