12 Months ago my wife and I bought a new van with a fixed bed.Although the mattress was better than the cushions that we had used in previous vans we were still suffering back problems for the first few nights of a trip. On someone's recommendation we bought a 2" memory foam topper, as it happens from Raskelf. The purchase has been brilliant.In March and April we spent six weeks in Portugal, Spain and France on a retirement holiday, without any back problems at all. Some mornings we were reluctant to get out it was so snug.