You want to use the Ford Transit Custom also as a towing vehicle for trailers? In order to answer this issue the car must be considered from all points of view, such as whether a trailer hitch (AHK) is available at all, the torque, and the maximum towing capacity.
The torque is at the Ford Transit Custom decisive for acceleration even under load - the more torque the better!. Torque is available at 360 Nm, which is already a decent value and guarantees that you won't have any problems getting off the mark as a rule.
The basic prerequisite - a trailer hitch - is given, because a corresponding device is already included in this offer.
Final assessment: Is this car suitable as a towing vehicle? Unfortunately, the Ford Transit Custom cannot be ordered with a trailer hitch, so it is also not possible to use it in trailer mode.
Designation