ActionCamper
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My guess is that it is the vertical support for the roof and the attachment support of the bulkhead between the cab & bed.
BTW Action Camper: Nice electronic modeling on your camper! what software did you use? Alias?
I was guessing the same, but I'd like to be sure. I work with SolidWorks. For me it combines a great technical solid modeler with a great surface modeler where solids can use surfaces as boundaries. For a normal presentation there is no need to use a separate renderer or animator. All this keeps the total process short. To make work easier I use a 3dconnexion 3D mouse. Of course taking time for the human figures would make things nicer looking, but soon we'll see reality.