It's not water from you A/C run off or morning dew or other moisture running down the coach?
If you go away for the day, disconnect from city water and turn off the water pumps do you see the same puddle when you return? Your post may have said that you can see a drip but I was not clear on that, sorry.
If you can see that, can you give us an idea of what is directly above the leak on the inside of the coach?
What I post is my 2 cents and nothing more. Please don't read anything into my post that's not there. If you disagree, that's OK.
Can't we all just get along?