Not sure what type "trailer' you have.
the w/h shower would need space on a outside wall. You would need gas/or 120 v elect and a water source for w/h. Probably would also need a 12v supply. The outside shower could be cut into the wall near w/h. You would need to connect to a fresh and hot water supply. Lots of work, but can be done. Do you have a 14x14 clg vent? All types OF 12v fans are on the market, and will fit the 14x14 vent hole. Again, you would need a 12v supply.