Pennsylvania requires an annual trailer inspection.
It is a "sticker" in the window. Only certain PA inspection stations are authorized to inspect trailers.
"Some" antifreeze? WTH does that mean?
They removed the anode and left the hole open?
Those threads will rust if left open for very long.
(also critters can get in there and they are hard to get out.)
I am sorry, but I would be looking for a lawyer and get your money back.
Lou and Laura with Bella - German Short Hair Pointer
2008 GMC Sierra 2500HD Crewcab SB Allison Duramax
2010 Flagstaff 8526RLWS - Superglide 3300
HAM CALLSIGN - KC3FFW