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I'm reaching out to inquire about a tricycle designed to support a payload capacity of up to 300KG. We are particularly interested in a model that can maintain a maximum speed of 40km/h. The ability to handle heavy loads efficiently is crucial for our operations, so any additional specifications regarding durability and performance would be appreciated. Moreover, we would love to know about the available features, customization options, and pricing details for such a tricycle. It would be great to get insights into the lead times for delivery and any warranty or service agreements you offer. We're looking to establish a reliable partnership, so any information that can help us in our decision-making process would be beneficial.