We recently received our ROO 233S and of course I had to do some mods.
I made a plywood box for the two 6 volt batteries.
Put in a tray under the sink that slides out for utensils and stuff.
Removed the silly cup and toothbrush holders to put a small basket.
A hanger inside and one outside the bathroom door for towels and jackets.
Heading out on our second trip tomorrow. Suppose to get lots of rain. We'll test to see if its waterproof.