Here's some mod ideas I did to our camper to increase storage.

Here are three undeerbed full extension draweers. Our camper has painted cabinets so it was simple to make drawer fronts and paint them with computer matched paint.

I made a false bottom for the underbed storage area to create a shallow storage trunk above the three full extension drawers.

This is another full extension drawer installed under the sink. The original space was cramped and hard to access. The drawer makes access much more convenient.
If, interested, you can see more of my mods as this
LINK