Has anyone done this or given it any thought? No bathroom walls, just a curtain.. Mount the valve and shower head in a cabinet if you don't like the look.
It might be labor intensive, but the rewards of not having a shower curb and the extra floor space might be worth it..
I can bend up and solder a 1" deep sheet metal pan, either raise the rest of the floor, or drop the floor joists in the shower pan area and then build some sort of a grate (teak maybe) the depth of the pan to make the shower floor level with the trailer floor.. Drop the front of the trailer a little to create fall for the water to find its way to the drain soldered in the very front, piped to a hepvO drain p-trap. I could cover the plywood with kerdi and then linoleum I have laying around.
Could it be done? Any potential drawbacks other than my GF making me leave when she showers?