Ok, here I am again on bended knee. In that same file, trailer_pup.ldr can't be edited in LDCad. I see that it doesn't have the same name as the other submodels. My suspicion is the original designer built it in a separate ldr and then imported it as an entire placeholder.
I used MLCad to export all of the submodels and opened the resulting trailer_pup.ldr but I still can't edit it.
It's all just data in an xml file so it has to be fixable but I have no idea what needs to change to fix it.
I used MLCad to export all of the submodels and opened the resulting trailer_pup.ldr but I still can't edit it.
It's all just data in an xml file so it has to be fixable but I have no idea what needs to change to fix it.