We bought a 2015 Adventurer 116DS a couple months ago and found the perfect product for the wet bath floor at Bed, Bath and Beyond. It is called Aquarug and is a mesh-like plastic mat that fits perfectly in the bath. It has suction cups on the bottom to prevent slipping. We leave it in the bath all the time....the water can flow through it while we are showering and is very comfortable on bare feet. It is easy to take out for a quick rinse mid-trip or for a more complete wash after the trip. It seems to be doing a good job protecting the floor and because it fits perfectly and is white in color, it looks like it came with the camper.
It has been a while since you posted this question, so you may have already figured out another solution, but thought I would post this just in case. BTW, we are loving our new camper!