In 1938, California’s Brooks Walker patented the 5th wheel device known as ‘Park Car’. With the use of a series of gears and hydraulic pumps and lines, activation was made through a button beneath the dash.

In 1938, California’s Brooks Walker patented the 5th wheel device known as ‘Park Car’. With the use of a series of gears and hydraulic pumps and lines, activation was made through a button beneath the dash.