I reckon this is my favourite of the "table" solutions... not casting aspersions at the others, but I really like the channel solution at the bottom to spread the load as well as the bolts to lock it in. Might be considered "overkill" by some but I reckon as a long term secure solution this tops. The only thing that I wonder about is the table rubbing on the bed base. Maybe slip some small foam/rubber in between to reduce rubbing marks. But then... if it doesn't move, it won't rub.
gi day @Smergen, yeh did think about a small strip of self adhesive neoprene a few mm thick behind, but wasn't concerned, the table sits out about 5mm at the bottom so if any rub marks where going to happen , it would most likely be a long the top edge.
wasn't really going for over kill ( the channel is only Aluminium), just something neat and easy.