I have been meaning to start this thread myself so good start. Yes I have caulked around all the sinks, notice the large gap around the bath sinks. I have also caulked the shower door, gives it a more finished look and seals too. Having lived in our 2015 35K for several months now I have checked all the p-trap connects, all were loose and one dripping. I also removed the 3 trap doors that expose the back of the shower from the bedroom area. I noticed a small puddle on the floor and traced it up to the shower handle connection in the rear were not tight. So tightened those and remove the faucet handles to expose the front of the shower faucet and clear caulked that area - leak handled.
Side Note: I'm surprised FW doesn't do a central water connection area where everything can be turned off from one location. I guess I was a little spoiled by our Mobile Suite.......