The Boler was a new concept to North America but not to other countries.
The Canadian Boler made a huge splash when it was first introduced to the North American market in 1968. Until then, 'tin and sticks' (a reference to aluminum trailers with heavy wooden under-framing) ruled the highways and campgrounds. Quite simply, no one in Canada had ever seen a lightweight fibreglass camper trailer until Ray Olecko brilliantly introduced one to a very enthusiastic market. However, long before the Boler arrived on the North American scene in 1968, lightweight fibreglass egg shaped camper trailers were very popular in countries such as Australia, Great Britain, South Africa, Holland, Germany and other countries.
The fibreglass building concept of making two fibreglass shells, top and bottom, and placing them together to form a trailer body was widely used in Europe and Australia in the very early sixties, long before the Boler came along.
Example photo right: 1961 Karosa W4 Dingo - Built in Czechoslovakia.
Design concepts such as a dinette table that folds down to make a bed, small counter with sink and propane burner stove top, small refrigerator, overhead cupboard storage, a front seating area, all were previous european design elements long before the Boler.
It can be argued that the reason the Boler trailer was never patented in 1968 is because too many of its design elements and manufacturing practices were already evident in several other earlier fibreglass trailer models.
Was the 1961 Karosa W4 Dingo a blueprint for the boler?
Boler's European heritage design was noted in 1979
Fibreglass trailers of the world earlier than the Boler