My friend owns a Honda CRV and, shortly after purchase, he experienced a knocking noise similar to the one you describe.
After a great deal of investgation on his part he finally discovered the cause of the noise was something to do with the straps/buckles (sorry, it was a couple of years ago and I can't remember the exact details) but it was something to do with straps which hold down the removeable seats.
If I were you I would very carefully check any straps which are connected with this function.
Of course, your knocking noise could be something totally different!
Edited by Galaxy on 02/09/2013 at 20:35
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