I am digging out >20 cu.yards of dirt and rocks for "raised" garden. Gotta go almost 2ft under to get the depth given the barrier and other stuff, the retaining wall will be only 18 in tall. I want about 40in depth at the middle.

It's weird host is basically doing the same thing. Well, it's not a raised bed but a huge dug out trench with a mesh barrier on the sides and ground against voles. The soil needs to be replaced every 2 years or diseases will infest the plants. It's a huge ordeal that involves moving at least 10m³ of heavy soil for a distance of about 25m and back. Well, we all know he's crazy. I wish we could show you what he's doing, but then you could easily dox him. Haa, we have so many cool things we can't talk about...