A common sized chiller box on this size truck appears to be around 5.5 metres long, by 2.5 metres wides, by 2 metres high.
With that in mind, I have been playing around in Sweet Home 3d, an open source, cross platform piece of software, to mock up an arrangement.
Based around standard measurements that I keep here http://www.nomadichome.org/accommodatio ... imensions/ I've put this basic arrangement together.
There are two external entrances/exits at 750mm wide by 1,800mm high. One at the back, from the living area, and one out the side, from the bedroom. The shower is 900mm by 900mm and the toilet room is around 750mm by 900. The bed is a full size queen, elevated from the floor, with 900mm sitting headroom above, leaving a large storage area underneath. There are two doors between the toilet and kitchen. the living area is a little over 2,700mm long. All wals are assumed to be 75mm (3 inch) thick. I haven't included any windows or ventilation in this sketch, just a basic layout.
Starting with a birds eye view.


Next we have a picture looking into the living area from outside.

Next is a picture from in the living area, looking across and forward at the kitchen bench, with the stove to the left and the edge of the sink to the right.

Next, also from withing the living area, looks across and to the rear, with the kitchen bench and sink visible, and the edge of the stove to the right.

Moving right along, this next picture is from the passageway, between the living area and the bedroom, looking aft, down through the living area.

The next one is from the bed. looking aft, passed the shower, into the living area.

And the last one, also from the bed looks down the middle of the living area, to the rear entrance/exit.

This is drawn up for left hand side of the road driving, so would be mirrored for a vehicle driving on the right hand side.