I used tile in my shower area but if I were to do it again I would buy a RV shower pan = you can find them on Ebay.
I like the look of tile but the trailer has to be level for it to drain properly,I found this out after I had built the shower and went on my 1st trip.
With the rv pan you won't have that problem.
I bought a small hot water heater off ebay I think I won it for 40.00 but I think they sell for 60-80.00 it works great but you have to also buy a water flow tap to control the water flow rate so that the slower the water goes in the hotter the water will come out,it also has a different type plug that you will need to cut off and put a standard plug on to it.
