Hi Barry
I manufactured the prototype from bits in the garage.
The pole is an extendable awning roof support.
The rubber thing is a drain plunger. This holds the pole in position and also can slide around if required.
I went underneath the bed and lifted it with my head and hands. It was reasonably easy.
Once the pole was in position the bed was very easy to move and the pole stuck to the bottom of the bed so it didn’t fall when the bed was lifted.
I’m pleased with the first attempt. Now I need your engineering genius to finish it
Tom