Abstract: A house trailer and boat assembly with improved integration of the specific elements of the trailer and boat configurations such that in each of the house trailer and house boat configurations as few as possible of the elements of the other configurations are noticeable. This house trailer and boat assembly comprises a house trailer box defining elongated lateral apertures, elongated lateral floats pivotally stowable in the house trailer box, elongated panels covering the internally stowed floats for the travel configuration, and end floats at the opposite ends of the house trailer box, and pivotable each between its boat position and its travel position where they cooperatively define with the house trailer box a generally typical house trailer shape.