Not sure if this is of help, but I have a Camper King conversion (Santorini) on a T6.1 with the 'upgrade bed'. After a bit of research, this is a Titan bed. I've found the 128mm wide version of the Comforts RIB Bed Memory Foam Mattress
(Comfortz RIB Bed Memory Foam Mattress Topper | Comforts) fits mine perfect and folds on to the rear shelf nicely.
Our bed looks like this.
(Comfortz RIB Bed Memory Foam Mattress Topper | Comforts) fits mine perfect and folds on to the rear shelf nicely.
Our bed looks like this.
