You might consider placing white HDPE tape on the front shell walls and ceiling where they touch the rear shell when closed. That's a paint wear spot. The 4 inch wide version would be good.
While you are painting, a lighting redo would be appropriate. Replace those flourescents with LEDs. I like
this one for the bathroom, sink, and range, but it might be too bright for the bed areas.
Pull the lights out of the two vents, and install the RV Chandelier in their place. You get about 20% more sunlight that way.