I purchased a 5 berth, 1990 Elddis Cyclone late last year, We checked the van for signs of damp etc, all seemed OK! however we have put our van onto a seasonal pitch and have been using it the last few weekends however have noticed as we lift the seat cusions to make up the rear double bed the under side of the cusions and back rests seem damp, at first I thought it was just me and that it was probably just very cold but now I do think it is damp. Again I've gone around the van looking for damp patches to walls, ceiling, floor etc and can't find any evidence of damp. Another theory I have is could this be caused from pure condensation or the van sweating, as the van is sitting locked up on sight, all blinds and windows closed from one week to the next without ventilation then we come along on a weekend to use the van, turning on heating, general body heat from a family of 4 and breathing etc. Any comments appreciated and also would this be easy to repair if it is Damp. Many Thanks. Andrew.