Use the TRAILER KEY in the lock; turn the key (N) and pull the handle (O).
Enter the Trailer.
Take the Shard and the ACORN 2/4 (P).
Take the CLAMPS and MIRROR (Q).
Grab the SUGAR (R).
Place the UNICORN FIGURINE in the slot; take the HORN PIECE (S).
Put down the SUGAR; take the DECORATION PIECE (T).
Go to the Gas Station.
Place the MIRROR in the frame (U); go through the hole.