I have a Hymer Ayers Rock. One of my hard boundaries was 5.4m max. Both my drive at home and the length of the vehicle with a tow ball bike rack on precluded anything longer so the GC was never a consideration. I really hoped that AS had an end bed in the fleet but, sadly, no.
I am delighted. over 200 nights now, and every night it is just a sheer delight to curl up in the most comfortable bed I could ever imagine in a camper. I also need the load space underneath it, which is huge, and when travelling, on top of the bed as well!!
I have never got over the feeling of being able to come "home" from a long physical day, put the kettle on, get stuff out of the fridge for dinner, get pans out of the drawer, plug in my remoska and my induction hob, pop into the loo and wash my hands, sit at my "desk", plug in my laptop and start writing and video editing, all without moving anything around or having to move anything out of the way to get to something else.
I'm sure that you will be delighted.
Jen