Hey HellWatcher,
I made a quick drop-in graphics prototype for the transport drone based on the current 36-direction sprite layout.
I uploaded the example file to your Dropbox as trailer_base_mk2.png.
It already matches the existing 1920x768 / 36 directions / 192x192 per frame format, so it can be tested directly as a replacement for trailer_base.png.
It is still only a prototype — shadow, player-color mask and cargo masks would need matching versions for a proper release.
greetings
MoSII