When I had steel framed pipe docks I put them in in a similar manner to what your picture shows. I had access to large truck tire tubes and doubled them up using a compressor to inflate them to the proper height for the dock.
I think you may be able to get tubes from the local tire shops. After a truck tube has been patched a couple times they usually replace them and will give the old ones away. I think that using junk tubes might be better than risking your expensive tube.
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