Ahhh...hook and cleats on bed frames will always fatigue and usually will tear out over the years. You will get a 'squeaky' bed rather quickly and you never want to push/pull a bed frame like that as it severely weakens the corners. With a proper 8-way bolt up bed (more costly to make) the bed will last hundreds of years structurally - if it gets a bit loose just tighten the bolt.

Glad you are enjoying your Treharn bed, Cookie! It's a good choice. Thank you!