We recently purchased a Coachmen Clipper 16FB. It has a wardrobe cabinet and 2 pantry cabinets without shelving. My wonderful wife solved the problem by buying Sterilite Modular storage drawers available from Target and Walmart. They are available in Large, 24 in wide x 17 in deep x 7 and 10in tall, and Medium which are 12in wide x 17in deep and 7 and 10in tall. The large work in the wardrobe for folded clothing and shoes. The medium work in pantry. They allow full access so you don't have to pull everything out to see what's in back.
Plastic shoe boxes also work well to organize stuff in the overhead bins.
type in wire storage shelves or Adding Pull-Out Drawers to Pantry in the Search button at the top of this page and you'll discover a variety of options from <$20 and upwards...depends on your preference.