Storage in the Roadtrek is art. Decide on what you absolutely need to have with you when you travel beyond your clothes and personal items. Stock some things into the RT that you use at home so that you do not have to pack everything when you go.
We use the cabinet under the sink for kitchen related items and have a storage box that is a slide out drawer for the bottom shelf which enables some things to be put on top and still have access to the draw and a storage box on the upper shelf that fits below the sink basin. These hold dishes, cups and utensils for two - no more than that are needed.
We have two small storage boxes that fit in the forward cabinet over the bed (next to the microwave) that hold each of our personal items that we use before bed and in the morning - comb and brush, toothbrush, razor, etc. Each is labeled with our name. In that cabinet we pack other similar items that we bring out to the RT from home for a trip.
Clothes go into the front wardrobe cabinet and I put soft side hanging shelves that are sold to help organize closets. A little looking (we found ours in Target) will find ones that fit in width. All will be too long so the extra shelf or shelves just sit folded on the bottom of the cabinet. When we are on a longer trip we pack half of the clothes in the wardrobe and the other half in a laundry bag under the bed. When we get to the point that we need clothing, the laundry bag gets unpacked into the cabinet.
Food items go into the two cabinets over the sink. All food items are in airtight sealed plastic storage containers to keep out pests.
Bottom line is be creative. And then don't carry what you won't need.
Take a look at my site linked below about life in a Roadtrek 190.
Enjoy your new Roadtrek!!!