I am not sure these cars have any connection at all. Considering the truck, the van were mentioned by LE but now seemingly abandoned. How would someone even get a body out of a compact car? You would have to get out, open the trunk, get the body out in the middle of the street? For what purpose?
I often carry my sleeping child (who likely weighs more the she did) from our compact car. Easily, actually...and I weigh maybe 100 pounds myself. She might not have been in the trunk. People carry any number of things in their car without others noticing, and she was likely covered