The transition from internal combustion engines to electric propulsion in road-cargo systems is underway but faces significant challenges for stakeholders and involved actors. Developing battery electric heavy trucks for long-distance hauling requires new approaches to concept evaluation and selection due to high data uncertainty. These approaches must align with OEM and transport provider business objectives while meeting environmental and societal requirements. The differing timelines of these activities add complexity, which can be addressed by modelling the road cargo system as a system-of-systems. This paper explores the state and outlook of conceptual modelling for key.