I have a 2007 Elgrand camper conversion incorporating a Roll down bed. having not used it for camping over the last few months, I lifted the Tailgate and saw mould along the bottom edge of the bed. At first I thought this was caused by water leaking through the top hinge however having monitored this for a few weeks I feel it is being caused by condensation. When closed, the Tailgate is pushing against the lower part of the bed, ie where your head would be if you were sleeping. I am seeing the pattern of the stitching on the inside of the Tailgate formed in the condensation so I know the 2 sides are touching. The bed is quite damp. Has anyone else experienced this? Apart from leaving the Tailgate or window open to air and using moisture absorbing products does anyone have any ideas how to resolve this.