Hi Patti;
Your 1975 Scamper was probably produced by Glendale Recreational Vehicles which would have made the Scamper in their Western Canada plant in either Lethbridge or Wetaskawin Alberta and Strathroy Ontario. Glendale used a pretty generic manual that covered all their brands of trailers such as Glendette, Golden Falcon and Scamper during the 1970s. An older well established rv dealer in your province may have carried Glendale trailers from this era and may have a copy of the generic manual or know where to get one. You may want to post a message on Kijjji as well as someone out there may have a copy. As some other posts have mentioned the information you may need can be found right here on this forum and through the publications mentioned. Many of the systems and construction techniques used back in 1975 are still being used today. Enjoy your Scamper , a very popular trailer in its day and many are still be used in campgrounds and on the roads here in Canada.
Lou
