Thank you for sharing this! Getting ready for winter has always been a bit of a mystery to us. We haphazardly succeeded last year but it is very helpful to have a road map! We bought a large bag of Silica Gel cat litter (about £1.50 in Home Bargains) and put it in disposable plastic food trays around the caravan (no lids on). These make very economical and effective damp traps. We also put some Kitty Litter in pop socks and hung them in the wardrobes to help keep everything dry.
For more tips, including how to save money while caravanning, see The Knowledge – Caravan Tips.