Creeping mattress

Fantastic new caravan  but problem with mattress our van has a transverse island bed the problem is that during the night the mattress slides down the bed making it hard to get past the bottom of the bed to use the bathroom we have tried several ways to solve the problem but finally think we have got it resolved by putting two  pieces of that stuff used to stop rugs from moving seems to of done the trick hope this helps if anyone is having the same problem 

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