I think our trailer floor plan is similar to yours. It too came with a "portable" table/sofa combination. The table was so big and heavy we stopped using it. Open it was always in the way and folded it was always in the way because there was no way to stow it. We found a solution that may work for you. We now use a gate leg table I designed and built.
Folded it's only 8 inches wide and tucks away easily. (we call this "cocktail mode")
Opened it's 38" inches long. Large enough to sit comfortably for a full meal.
You may not care to build such a table yourself, but they are available commercially. Ikea would be a good place to start looking. This solution may allow you to continue with your current trailer and postpone buying a larger one until your child is a little older.
