While they are good ideas for storing items , the way I read the OP was ideas for prepping the unit to be stored.
That said when I prep mine for the winter I do the following.
Drain and winterize the water system. Including pulling the water filter.
Can't remember the name of the product I use off the top of my head but I put in a tub that pulls humidity out of the trailer.
Pull all food that is not sealed against rodents and bugs. This is for short term storage too.
I'll give a lite lube to anything that may need it, slides, stabilizers, hinges.
Finally I hit the trailer with a six month long bug spray around all openings.
And that's about it.
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