It is safe to say that over the past two centuries or more, European design and innovation has had a significant influence on western culture, be it through shared knowledge or shared skills by various means including immigration. No wonder then that European moulded fibreglass trailer designs, manufacturing processes, characteristics, and features made their way from Central Europe over to North America in the late 1950s and early 1960s.
Perhaps not a coincidence then that all three Boler manufacturing partners, Ray Olecko, Sandor Dusa and Erwin Krieg, each pooled their resources together in 1968 to design and manufacture what would become a very popular Canadian lightweight travel trailer having very similar manufactured design features and characteristics of the earlier moulded fibreglass trailers of Europe. Whether or not the partners researched and obtained pre-existing blueprints or drawings from Europe remains a mystery. The video below might explain how this could be the case.
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 the United States, 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 and U.S. 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.