Crawl under the trailer and look up. You will find 3 pipes sticking out of the underbelly. One will be your fresh water tank drain and the other two will be your low point hot and cold water drains....
They may be along the edge (side) of the underbelly, outside the frame rails or they may be in the center of the trailer underbelly. It all depends on where the plumbing runs are installed in your specific floorplan. Every floorplan will have the low point drains in a different location, depending on where things are located above the floor.
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