It turned out to be a lot quicker than I thought to update the second issue and I have caught back up with where I [thought I] was a few hours ago.
All combo/standalone trailer mods should now be fully updated for patch 1.19x. A full list of updated mods can be seen below, along with the earlier mods listed in the previous post.
F1 Combo Pack (and individual combos)
Banks of England
Thompson Plant Hire
Companies with Standalone trailers
Big Malcolm Mod
Big Stobart Mod
Children in Need