The paper develops, for partners, a decision tool to assess the economic and ecological impact of collaborative freight delivery, before accepting to integrate a horizontal cooperative coalition. The proposed mechanism is based on the design of a sustainable collaborative supply chain for specific competing dry food distributors in Morocco. The success of such practice requires addressing different issues, among them: the redesign of the supply chain and the fair cost allocation to participating partners. An extension of the two echelons Location Routing Problem (2E-LRP) was exploited, to investigate how this collaboration can support the participants during a predefined planning horizon. The Shapley value method is used to evaluate the individual opportunities savings. We opt for Multi-objective to detect a good trade-off between the economic objective and the ecological one. Case study confirms the economic and environmental positive impact of the shippers’ collaboration with different optimal network configurations.