Image Number 2 for United States Patent #7891634.
A trailer rail assembly includes a base plank with a planar top surface raised above a horizontal plane and extending along an entire longitudinal length of the base member. Such a base plank has a U-shaped cross-section. The assembly further includes a cylindrical shaft with an annular cross-section spanning along an entire longitudinal length of the top surface. A support plate is statically and fixedly attached to the shaft and spanning along the entire longitudinal length of the base plank, and a mechanism for simultaneously rotating the shaft and the support plate in sync and about a fulcrum axis extends along an entire longitudinal length of the shaft while the base plank remains statically affixed at a stationary position.