G'day juliezap,
Main things i'd recomend.........
12v Power Supply
12v Fridge, I can recomend Evakool RF60 (white fibreglass model)
12v Lights like Korr Lighting Kits, they'll probably have a stand at the camping show too, might grab a bargain.
Drifta Kitchen and Pull Out Draw set up, or something similar. (i like the pull out draw as there is no need to lift bed base.)
Inner spring mattress or good comfy foam one.
Definately, as others have said, the high canvas cover.... allows for bed pillows doona's folding chairs etc to be stored on bed when packing up/travelling.
catch ya!