CAT 745C features a dedicated Container Carrier used to carry Container Small and Container Special, but the game feature yet another 2-slot container, and that is the Cabins used ever since Yukon. For some period of time, although not intentional, on the course of the bug Cabins were an available to carry by CAT which seemed to be a logical choice, it's been fixed since. Yet I propose to add it back, CATs are generally useless in the game so every opportunity to use them in some unique way is priceless, having it being able carry Cabins back again surely enhances its use in every next region after Yukon and Yukon included.
All it takes to do, is in \initial.pak[media]\classes\trucks\addons\cat_745c_container_carrier.xml
in line 17, add this , CargoForkliftCaravanContainer2
to the list of IncludedCargoTypes.
And if you are bothered by the fact the Cabin is in fact slightly levitating and the straps don't make much sense, normal Container Small doesn't look any better, so you may go ahead and create custom packed model for CAT for all 3 types of container, with straps removed or repositioned and the cargo model sitting more appropriately on the container bed.
but I'll be more than happy to just have Cabins on it in any form