Yes, it is a bin lid and a tyre filled with concrete.
The rotary line can be lifted out easily leaving just the galvanised pole/ tube, maybe 3' long.
It is very very heavy. I.e., It has never blown over even when full of laundry.
Could be used as a swingball base?
You will have to come up with some serious transport methods!
Rotary washing line with heavy base (Street)