JayMartin, have you actually tried out the corner bed floorplan ?
When we went from TC to the class 'c' corner bed floorplan , we tried making the bed in the same fashion as our former TC's , from north to south .
We find it much easier to make the bed from east/west. Tuck it in along the passenger side first then tuck in the bathroom side. That way you can reach in to pull it taught towards the bathroom and make it look nice n neat.
It seemed to be an easier make.
We have also used a zipped together double king and double zipped together queen sleeping bad set in a lighter weight and used 2 top sheets sewn together as a full liner that can be easily washed.
That was the easiest to use and it feels like sleeping in a regular bed, not restricted. Just do not sew the sides of the two sheets all the way up (sew it 1/2 way). Leave room to get yourself easily in/out. It was just like having a Travasac. or rv sleep system.