Maybe It's A Prototype

Long time contributor, Griz, told Mrs. Griz to take this picture and send it to me.  He delegates well.  Click the picture to enbiggen.

I'm going to go out on a limb here and say that's an aftermarket structure.  What gives me that feeling is the teeny tiny air conditioning unit.  Also, the unopenable door.  And the security light.  And the dryer vent over the tire.  And the fact that it looks so top-heavy that it would fall over changing lanes.  But that's all.