Aside from just my gut feeling that the Kia was never planned to be hauled away in the stock trailer, I still believe it would have been extremely difficult, and not a very quick task, to load it onto the trailer, IF it would even fit. While there are some that are 8 feet wide, the standard stock trailer is 7'wide, with an actual interior width of about 6'8". The width of a Kia Sportage, which is what I have read VB owned, but also the width of most misdsized KIas, is about the same, depending on year, is about 6'1, and that does not take into account the external mirrors on either side, which could be folded in. Assuming the trailer had a ramp capable of driving the Kia into the trailer on, it would have been a helluva tight squeeze, at absolute best, to get the car inside. It certainly would not be a matter of jumping in the car, driving up and in, and being gone in a couple minutes time. And the driver was not getting out, unless the car had a sunroof.
I do not believe the stock trailer was ever planned to haul the car, nor do I believe that it realistically could have. I believe it's role was merely to block the road, and perhaps provide the means of getting the victims to the burial site. JMO