I have a 1958
Traveler, California made 18 Footer. There is a Toilet on the Curb Side but there is no Shower.
We are not going to worry about a Shower because of the possible Rotten Floor Problems. Our Traveler doesn't carry much Feshwater so a Shower would be hard on that supply. Besides at this point in our lives we want to have cocktail Hour while sitting with Full Hook-ups.
You can go to the link above to see the different layouts, the 1958
has the Brochure with the same layout as we have; 59Traveler