Section 54 (Security And Locks): Receiver: Installation
WARNING: This page is about a different car, the 2014 Subaru Forester. However, it is still accessible from the selected car via links, so may be relevant.
Install each part in the reverse order of removal.
Tightening torque:
Receiver assembly: 13 N.m (1.33 kgf-m, 9.6 ft-lb)