Frustrating... Sure.. Knowing how you took care of your trailer for so long and in 2 years, it's now leaking... Well, either there was leak that you had no clue of or because they didn't inspect?? Who knows.
Don't fret it! Yes, you sold it to family, so you will be the one to hear about it for the rest of your life!!
Does not matter the neglect after it left your hands.. You are now the one that sold them a leaking trailer...
Now, if you just gave it to them for free... Too bad, so sad... I don't sell anything to family or friends... Give it to them or not at all..
Don't ask how I know! :)
Mitch