Lockbox for a coupler of a trailer

A lockbox for a coupler of a trailer, the lockbox comprising a bottom assembly, a top cover, and a locking mechanism, wherein:

• (a) the bottom assembly comprises a bottom panel, a front panel, and two side panels arranged so as to define a lockbox interior volume, an open top area, and an open back area;
• (b) the bottom assembly further comprises a post mounted on the bottom panel within the interior volume, which post is arranged to be received into a socket of the coupler of the trailer with the coupler received into the interior volume through the open back area;
• (c) the bottom assembly and the top cover are arranged so as to engage one another with the top cover covering at least a portion of the open top area above the post so as to prevent removal of the coupler from the post;
• (d) the locking mechanism is arranged, in a locked configuration, to retain the bottom assembly and the top cover engaged with one another, and arranged in an unlocked configuration to enable disengagement of the top cover from the bottom assembly;
• and
• (e) the bottom assembly further comprises a substantially rigid tubular member positioned around a lower portion of the post and arranged so as to be rotatable around the post and to obstruct access to the post with the post received in the socket of the coupler of the trailer.