He did have two trunks worth of books and such for Nick (that’s why Josh’s father was so intent on finding him, besides handing over the key). We know they were able to save some things from the trailer, and that some of the books were at Rosalee’s shop and at Nick’s house, but a lot was lost.
The first time I saw Iron Hans, I compared losing the Trailer to Dean and Sam permanently losing the Impala. Or the Doctor losing his TARDIS. It’s more than just a thing – it’s a character within itself. With a story to tell and so much history.
We had a mild identity crisis at FYNB after the Trailer burned because our liveblogging tag was “Liveblogging from Aunt Marie’s Trailer.” We’ve had to change it since then.
Team Grimm’s job is going to be much harder from now on without all that knowledge at his disposal.
I’m going to finish this response with a shameless self advert of a vid I made after Iron Hans last year that I’m thinking I might update, but here ya go . It’s a farewell to the trailer. May it help you in these difficult times.