Instead of faffing about with sheets,blankets,duvets etc. we recently purchased a double sleeping bag and liner quite cheaply from GO Outdoors.
Tried the arrangement out for the first time whilst at Cawood and it worked very well,much quicker and easier to use than bed linen and warm as well.
Had another try using the rear bed but have decided once and for all that the front is much the better option.
Have taken the "mobile cushion" home,never to be used again.