The area under the bed is divided in compartments, from front to back: batteries, toilet, inverter & solar controller and bed linens with some extra space available on top of the wheel casing. The battery compartment allows a maximum of 4 batteries with a vent hole to the outside. I put the toilet next to it, to act as a separation between it and the electronics.
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The area above the rear wheel, received some rigid insulation board at the walls first, and then filled up with house insulation,
The final result.