I have used all the flat yard I am able to occupy for about two cords of wood. I have more wood from dead ash trees that I would like to process and stack, and have some sloped yard that I am trying to utilize with mixed results . I am curious if anyone is familiar with any Yankee ingenuity for such an endeavor. Curious thoughts on how a holz hausen would fare? Calculation comes to between 15- 20% gradient. I understand that a retaining wall and filling the area may be the solution, but is there another way that I am unaware of? Thanks