Don, I don't have any useful pics of my Trillium at the moment but they wouldn't help you anyway. Here are my observations... Most of the photos of original 1300s I have seen have those 3 hatches on the street side, cable, water, drain, but some have only one. On the curb side most have a tank fill hatch at the rear like mine, some do not, and some have a cable hatch between the door and the wheel. Apparently these, like the smaller
jalousie windows in the door and kitchen, and the louvered vents for
fridge and heater, simply reflect the options chosen at the time. Also some (most) have the square door handle while others have the smaller rectangular one. One other subtle difference is in the extruded logos on the door and body. Some, like ours, have the horizontal "wings" on the bottom and some don't. Obviously there were 2 different molds used in construction but I don't think this provides any clue as to date of manufacture since it appears that both were used simultaneously. How much of this is related to mfg date? You tell me. BTW the
VIN for my '77 is 132205394. You may find this interesting...
Two Trillium Trailers Fred