What is the best Ford Transit Custom engine for towing heavy loads?

I'm considering buying a Ford Transit Custom for my construction business and need an engine with enough power to tow heavy loads. Which engine option would you recommend for this task?

I own a Ford Transit Custom with the 2.0L EcoBlue diesel engine and it has never let me down. It has enough power to tow heavy loads and is efficient for everyday use.

You can't go wrong with the 3.5L V6 EcoBoost engine. It has plenty of power for towing and is also great for traveling long distances.