Have you ever owned a camper? I have. And so have several of my friends and family, some of whom have made modifications and/or remodeling. You can't tell what is in a camper from the outside, so even if we have a picture, it won't tell us anything about the interior or whether modifications have been made to it. Hidden compartments CAN be incorporated into them. There have been times when we found small areas that we didn't realize existed when we bought a camper. We've talked about making hidden compartments in our own camper (because it would be kinda cool) and how it wouldn't be difficult to do so.
The underneath of some campers are enclosed to help insulate against very cold weather. This is something that could also be modified especially if a person makes changes or repairs to the holding tanks for water and/or sewage. Which is why I asked about the camper. The older it is, the more likely modifications or remodeling has been done.
Personally, I also seriously doubt the camper was used for such an awful purpose, but then again I've read threads here about people who do terrible, awful things like hiding their deceased children in walls, garages, freezers, etc. So it isn't out of the realm of possibility to consider this angle in regards to the camper. It was there, there's the potential ability to hide a child or evidence of a crime until the perpetrator could conveniently dispose of it.
