I tried using my set on Fraser Island, but they didn’t work so well for me as I was on my belly & had the Jayco in tow.
The wheels just spun & wouldn’t grip enough to drive out
& yes I dug out the sand from all 6 wheels. They did grab hold of the tyre & pull them down into the sand but then the wheels would just spin, even at idle
Don’t get me wrong I can see their potential they just didn’t work for me in that situation.
As for the question about retrieval, I tied a length of rope on to each one & attached them to the rear of the trailer so I wouldn't have to stop again in the soft sand to retrieve them or walk a long way back to then dig them out.