is a 17', so details will vary, but here are some places the serial number appears on mine:
- information plate beside the door (also shows manufacturer's name, factory location, date built)
- weight rating or other regulatory sticker (made of foil) near service inlets on street side
- printed information sheet pasted inside the closet
- inside the owner's manual (see page 5 of the 1979 Boler Manual in the FiberglassRV Document Center's Boler manuals page)
Some people describe a plate on the frame, usually on the curb side of the tongue. In my case, I found that the plate which was riveted there is just a standard label which says to look inside for the serial number, presumably for people who expect to find a serial number there. As far as I can tell, there is no serial number anywhere on the frame of mine.