The collection was in my parents' FL condo for 30+ years. Pop had them on some cheap graybar shelving. When I packed them, I made sure the boxes were snuggly packed so they wouldn't shift, lean or sag.
I plan on using the Kallax system in our next home as the storage solution. The thought however of doing that in a storage unit somehow doesn't seem practical.
Thank you all for your thoughts.
Happy listening.