Let's see if I can link photos correctly from Google Plus...
Our 21' Class C immediately came under criticism from DW for a lack of a pantry. We don't have any plans to use the wardrobe, so one side was converted into a pantry:
Measured and built a frame for full extension slides so our modifications could be removed by the next owner:
Note pegboard on outward side so she can hang utensils.
Finished it with five drawers but the top one was too high to be useful to her, so it's back down to four:
Now I needed some way to lock the drawers in place while driving. That's a 5/16" steel rod ($6 from Home Depot) that slides up into a through hole on the top, and down into a recessed hole in the bottom. It snugs up against slides (bracket adds extra support) and prevents drawer slides from sliding open: