Full-line forcing. if a supplier requires channel members to carry a broad group of products (full line) in order to sell any particular products in the supplier's line this practice is often referred to as full-line-forcing. full-line forcing is used to varying degrees in a wide range of industries. if represents, up to a point, a legitimate effort by the manufacturer to see that a broad range of its products is carried by channel members line. the antitrust issue emerges when full-line forcing occurs to such an extent that it prevents other suppliers from selling competitive lines through channel members who are "loaded up" with the products of the supplier engaging in full-line forcing.