The mysterious tarpaulined object of Shardeloes Road

BCer The Old Trawlerman wants someone to put him out of his misery. He writes:

This mysterious tarpaulined object has been on Shardeloes Road for a couple of months now. Anyone have any idea what it is? Vehicle of the future? Inflatable rubber pasty?

UPDATE:

Ian has taken this shot of the mysterious object uncloaked. Still none the wiser: