I spent a long time trying to engineer the strongest and most cost effective way to make this happen. I wanted grass right to the edge of the tramp which made it more difficult due to the chance of cave-in. The PT retaining wall should hold for 5 years. The posts for 10-15 since they are in concrete.
Costs: about $300 in material (not including tramp) and $10,000 in sweat labor!
Here are pics from underneath.
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