Roof racks + upside down table = basket ?

On the motorcare website they sell a nifty idea of heavy duty roof racks and a table turned upside down that bolts onto to the racks to make a basket set up. Very expensive, but probably cause it is very heavy duty and good quality. If i am don't need a heavy duty set up at the moment cause of short beach trips (as opposed to desert corrugations trips) do youse all think i can get a fold up camping table to bolt onto my average quality roof racks and tie down a roof rack bag to it to achieve the result of storing soft stuff like tent and clothes bags ?

cheers