Here are some things I have done over the years for storage on the inside of the trailer..
This pantry was just a really deep cavern, so I made it a pull out shelf.

I ditched the folding table and facing bench dinette to this. Gives me a lot of storage under the seats, but all in a longer area.

Here is the end result. We don't miss the table at all. We have a couple of TV trays if we need to eat inside. We usually eat outside, since we are only weekend campers in the summer.. ;)

I've done some more shelving updates to the other closets and upper cabinets to utilize the space better. (sorry, no pics of those.) We too use those spring loaded bars to hold stuff in the cabinets and such.
Owned this same TT for over 16 years now and still modifying it and always end up saying "why didn't we do this sooner?" :)
Mitch