Fiberglass reinforced plastic lightweight heavy-duty ladder and method of making same

A lightweight heavy-duty ladder, comprising:

• at least one set of rails, wherein:
• each said rail has a long-axis;
• and
• for each said rail of the at least one set of rails, a transverse cross-section of the rail comprises a center portion, a left sidewall portion adjacent and substantially perpendicular to the center portion, and a right sidewall portion adjacent and substantially perpendicular to the center portion;
• a plurality of rovings wherein:
• the rovings are embedded in and extend longitudinally along the long-axis of a respective said rail in each of the center portion, the left sidewall portion, and the right sidewall portion;
• an article roving density of the center portion is lower than a corresponding said article roving density of at least one of the right sidewall portion and the left sidewall portion;
• and
• the article roving density is a ratio of a number of said rovings per transverse cross-sectional area of the respective said portion;
• and
• a plurality of rungs disposed between each set of said rails of the at least one set of rails.