judder

Hi all when I pull away with my caravan on the back of my Superb I get bad juddering. If I give it more revs the front wheels just spin and I am worried if I have to start off on a hill in the wet I wont be able to get enough grip to get moving. Don't know if it is the clutch starting to go and, if it is does anyone know how much it costs for a new one. I am assuming it has never been done and it has done 118000 miles so assume it has the dual mass flywheel. Any help very much appreciated