When I took my E560 to be weighed the other month it came in around 3350kg (Not got my weigh bridge ticket to hand) and that included:
120kw solar panel
36ltr Gasit tank
Air awning
Full tank of diesel
Half tank of water
Various other bits and bobs + me in the drivers seat.
PS... Just looked at my weigh bridge ticket and it weighed in at 3180kg
Pete