Congratulations. Sounds like you got a good trailer. We'ell all be waiting to see some pictures.
Unless someone has removed it, inside the closet door is a piece of paper with all the particulars about the trailer on it. The ownership should say the year and weight
The back and front windows
in the 71's are solid, don't open (like the Bolers). Not sure about 72's. 73's have both back and front windows
fully louvered. 75 and up they made half the back window a solid pane escape
hatch and the other side is louvered.
The frames on the early Trilliums were pieces welded together, like the Bolers. For sure the 73's and up have two solid frame rails, from the receiver back with cross braces between.
Geez, my mind is not working right now. I know there are some other differences but can't think of them.
So what colour is it. We have a 13' green 75.
Pictures please, we love pictures.