TrueDelta has nothing on the Transit's relablity, only Consumer Reports where trends can be seen over the last three years only. 2014 was the first year of this model's construction and it shows as it not being reliable at all. Fuel System, Climate System, Brakes, Paint and Trim, Body Integirty, Body Hardware, Power Equipment - all below average or much below average.
2015 gets better to average overall.. Average reliablity on the transmission and climiate system. Below average on Body Integrity, much below average on Paint/Trim and power equipment.
2016 above average overall. Average on the fuel system and climate system, little below average on power equipment.
If you stay away from the power equipment it might be okay for a few years. Cargo vans are a really tough catagory to find something really reliable. Kia Sedona and Toyota Sienna are more reliable but are more like minivans rather than a cargo van.
Other Cargo vans with no reliablity data anywhere include the Chevy Express/GMC Savanah, Nissan NV200, and Mercedes Benz Metris.
None of these including the Ford drive all that well or get great gas mileage. However, the can carry a lot of items. Sorry cannot help more - perhaps someone else has more data or information on any of these options.