In a move that could have a significant impact on the transportation industry, Isuzu and Toyota have teamed up through a joint venture to mass produce a light hydrogen fuel cell truck. The truck, which is based on Isuzu's light-duty truck platform, will be powered by Toyota's hydrogen fuel cell system.

The partnership between the two companies is expected to accelerate the adoption of hydrogen fuel cell technology, which is seen as a promising solution for reducing greenhouse gas emissions in the transportation sector.

However, the specific location where the vehicles will be mass-produced has not yet been determined. The two companies will likely consider various factors, such as cost, infrastructure, and local regulations when deciding on a location. It is also possible that they may choose to build a dedicated manufacturing facility for the new vehicle.

Toyota's fuel cell technology is facing competition from a number of companies, including Hyundai, Honda, Nissan, and Daimler. Hyundai has been a pioneer in fuel cell technology, and its vehicles have been on the market for several years. Honda has also been developing fuel cell vehicles for some time, and it has been working on improving the performance and efficiency of its vehicles.

For the Isuzu and Toyota hydrogen fuel cell truck to be successful, it will need to be able to outperform its competitors in terms of performance, efficiency, and cost. The truck will need to have a range that is competitive with or better than the ranges of its competitors, and it will need to be able to refuel quickly. 

Additionally, the cost of the fuel cell technology and the hydrogen fuel will need to be competitive with the costs of the technologies and fuels used by other companies. If the Isuzu and Toyota trucks can meet or exceed these benchmarks, they will be well-positioned to compete in the market.