Has anyone had any experiences on what size electronic bed to buy? I am looking to purchase a bed. I don't know if to buy a single electronic bed for my mum or a double. She is used to a double, but I don't want to make a mistake by buying the wrong size and make life difficult for her by it being too small. Has anyone bought a Double and it's been to difficult to move the person you are caring for. Regards Valk.