Trillium / Outback in Calgary had a melt down of their phone system. You can still get a hold of them a this number: (403) two seven two - 3941
I don't think your trailer is a 1979. The fact that your door window opens, indicates that it is probably a 1978. If your want to be more sure, then compare the serial number on the upper right corner of the data sheet that should be on the inside of your closet door to this list:
http://www.fiberglassrv.com/forums/f...tml#post460996