I did not stack my units. I used them on a slanted wall. With 6 units plus 4 shelfrod packs , everything was included in all packages in great condition. Units we’re packed great. They are heavy so I did need help carrying them up the stairs.  I put them all together myself. Instructions easy to follow. If something doesn’t seem to fit it is because it is upside down or pieces not put in right places.  Don’t force parts together, they should all go together with a gentle tap. I used rubber mallet being careful not to damage.  With the help
From Wayfair and Closetmaid I turned my closet into usable space. Thank you Wayfair!