I drive by a white trailer everyday. It is parked in a yard with about a 5 foot fence around it, so I can't see much of it. I have tenitively decided it is
fiberglass....but haven't ever seen anything like it. It appears to be shorter than the small 13' trailers. One the door side it has one window near the back, and it looks as though the whole back opens up (similar to a toy hauler maybe?).... I have half a mind to stop....it has been there for years and hasn't ever moved....perhaps they'd be willing to part with it (really wish I knew what it was though...I will try to snap some pictures).