You may have to lift the towing ball back up an inch or so to keep the caravan level or at least reduce the likely grounding of the nose wheel etc when on the road.
My multivan is bog standard and I am still tempted to add a plate to lift the hitch ball an extra half inch or more to help level out the towing position. You can get plates but you have to be sure there is room to fit them and that you are not creating other trouble with opening of rear doors etc.
Take the van to a caravan centre and talk to their tech people. If the Caravan nose is too far down its not good, but a little bit nose down is not a problem, just that the bum end of your caravan leaves cars behind looking at your spare wheel on the caravan.
Good luck and happy towing...dragged my Caravan down to Sth West France this Summer. No trouble. T: