After looking and looking I decided how I would add shelves to the hall wardrobe in my 2014 25' rear bed FC.
I went to Lowes and bought some close spaced 20" x 4' wire shelving and some medium duty Command Strip hooks.
I cut the shelf to the width of the closet - 1/4" and used a 13" spacer block to mark the bottom of the hook. I installed 2 hooks at the rear on the aluminum and 1 to each side in the front. Once the first shelf was in, I used my spacer block to mark out the location for the 2nd shelf. Worked good and should hold lightweight items such as towels or clothing. My bowling ball collection will go somewhere else.
Visually evidence of said shelving: