Paper towels between glass plates and dishes in the cupboards to prevent rattling.
If your fridge doesn't already have bars to contain sliding items, purchase some inexpensive ones from camping store.
If you have a residential fridge, install a supplemental latching system to prevent the fridge from coming open when you run over that curb . . . . don't ask me why I know this . . .
make a rack in the front genny compartment, or propane compartment for gutter material for stinky slinky . . . also works great to hold that LONG hose you bought!
Roadmaster spare tire carrier to hold that spare tire and not take valuable under coach storage space, (but that's really another discussion!)
Plastic storage trays in overhead cupboards to store DvD's, games and such so you can pull out entire tray to go through instead of having to stand on stool to see what's in them.
If you have an older coach, replace the CRT TV's with flat screens. Mount the one in the bedroom on a swing are and use space behind to store linen and such!
Build or buy small baskets to install by the night lights on either side of bed for things like emergency flashlights, ear plugs, chapstick, or whatever.
In pass through or undercoach, build a wood tray that extends above the frame rail to store brooms, beach umbrellas, stick thingie used to install magna shade on front winshield.
That ought to get you started!
Memory is not what it used to be...
Linear Mode
