You and I have the same trailer except yours is the G2 model. Yours has the bigger slide out with fridge, couch and closet.
My drains are located outside. I do not have any valves inside except for my bypass valves when I winterize.
Congrats on getting it all set up at the seasonal site.
You are now a member of the "TT" club. You have been since the day you took it home from the dealer.
Did your dealer turn on the furnace for you during your PDI (Pre-Delivery Inspection)? If not, I recommend you do it when you can with the windows and doors open. It will smell for about 10 - 15 minutes.
I posted a picture earlier about one of the minor issues we had with our 25RKS.
The wallpaper border under the window and behind the sink began to bubble and lift. Our dealer replaced the wallpaper border AND placed a piece of plexiglass over it to protect the wallpaper from lifting again.
You may not the same problem, but this is the solution that me and my dealer came up with and submitted it to Jayco as one modification they could make.