Smaller fifth wheels no longer made??

The reason in my opinion that there are so few to choose from is that the selling dealers refuse to stock a smaller unit and would rather sell the 42' models. Since the dealers don't stock the smaller units, the buying public is not generally aware of smaller units so the manufacturers aren't catering to that crowd and don't build them. Even if a manufacturer does build a smaller fiver, just try finding it on your local dealers lot.