Duvalays 2

Hello

I posted this question in the motorhome section, but I think it may be better posted  here...

Were considering buying a couple of (really expensive) Duvalays for our van. For those that dont know, these consist of a memory foam mattress topper stitched to a duvet in the way an open down one side envelope would be.

Has anyone got any experience of these? One point we are hesitating on, is that the duvet parts look to be oversized, and we only have 120cm max width to play with. Raskelf will cut the memory foam to size, but Im a little concerned the duvets will fold over each other in the middle andbe double or even treble thick in the centre of the bed?

Many thanks