I've got similar Santa. I got them from Spotlight in the sheet section. Work a treat. I can't get a fitted sheet for my CV single beds, only flat sheets. So those stretchy things do the job.
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Live Life On Your Terms
DOUGChief One Feather (Losing feathers with age)
TUG.......2014 Holden LT Colorado Twin Cab Ute with Canopy
DEN....... 2014 "Chief" Arrow CV (with some changes)
Have a look at www.truckersbed.com.au Doug, they make a fitted sheet with a sewn-in top sheet.They are great for beds against the wall, had one for years when we had our Avan Cruiseliner,really make bed making easy. Hope this is of some help. Ron.
It looks like a fairly light mattress which makes it a little more do-able than otherwise. I wouldn't wnat to do that on anythign but a light foam mattress, preferably somewhere that is not so tightly constrained as a caravan.
I have a long length of rope that is looped around the mattress.
When I need to change the sheets I just roll the rope loop off, remake the bad and then roll the rope back down and over.
As an extra bonus it gives me a grip for tugging the mattress away from the head panelling before I lift the bed to get to stuff underneath. Otherwise the mattress presses into the head board as it raises which can, after time, cause the board or the bed base to separate from the structure.