Decarbonization of trucks is necessary to achieve 2050 climate goals. The International Energy Agency (IEA) classifies trucking as a tough to decarbonize sector and projects global emissions to reach 2.5 Gt of CO 2 per year by 2030, a 25% increase from 2020. 1 Within this sector, long-haul trucks contribute to 39% of the sector's greenhouse gas (GHG) emissions, despite accounting for only 9% of global cargo vehicles. The importance of long-haul trucks is even greater in the United States where they carry 71% of all payload, and their demand is expected to double between 2020 and 2050. Mitigating emissions and meeting climate targets requires replacing existing diesel trucks with renewable options.