I can't speak with absolute certainty, as I don't have a set up like yours, but based on what I've been reading here on the forum:
I believe the newer TTs are coming without the old gravity fill connections. (Gave evil-doers an opportunity to put something in your tank). Your 3 connections are: top - black water tank flush, bottom right - antifreeze (winterizing) connection, bottom left - city water connection. I believe you probably have a valve somewhere in the city water line that you would change to allow the city water to go to the FW tank to fill it.
Do this slowly, though; you don't want to blow up your FW tank!
UPDATE:
Quote:
The fresh water tank fill is on the opposing side near the bottom right corner of the furnace vent.
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Looks like I stand corrected. I think what I said is still correct, but doesn't apply to your TT.
Unusual that it's on the curb side, and not on the street side with the city water connection.