Bowlus was the first all aluminum travel trailer designed by Hawley Bowlus in 1934.  It is ultra-light weighing only about 1100 lbs.  It is made of panels of riveted alclad aluminum that is screwed to a galvanized steel tubing that is acetylene welded together.  This constuction method is very similar to the way aircraft were constructed.

The trailer is insulted and trimmed in birch plywood.  The galley which is just inside the door at the front came standard with a sink, icebox, water tank, stove.  The central area on the left has a couch that converts to a bed and on the other side a table and two chairs that also converts to a second bed.  Then there is a clothes closet on the left side and a chest of drawers made out of aluminum on the right.  The door to the clothes closet opens to give the rear bedroom privacy. At the back is a bedroom with a V bed and a small cabinet at the very rear.   It's 19 feet long and 7ft 6" outside and inside it's 6'1" since I can stand up in it.   About 200 were built of which mine is number 149.

Links on Bowlus Trailers