Hi Ian, In our Coachman we have the side bed with a slight cutaway, at first we bought Duvalay, fitted sheets and a topper mattress, then decided to replace the mattress with a memory foam one specially made, it is really good very comfortable, BUT, my mistake, went for a 9 inch thick one instead of 6 inch. The Duvalay sheets are really a tight fit so we now just use a normal fitted sheet and tuck under the overhanging bit. On top we just have a normal duvet and pillows. As soon as you mention "Caravan" the prics go up.
https://www.towsure.com/duvalay-memory-foam-sleeping-bag-2-5cm-sky-blue?gclid=CjwKCAjwiPbWBRBtEiwAJakcpPy-1iHiB8UOM9HZzOI4eDetyIjd3P4VGVirfXwzK16uGl9UtHsmYhoCPbAQAvD_BwE