Problem comes from the lack of trans fluid being circulated through the system. Some vehicles can get enough splash to protect the internal components. Your owners manual should talk about tow truck mile limitations. Should be able to project how it would flat tow based on the mfg recommendations
Here, I checked the owners manual
http://www.kia.ca/content/ownership/ownersmanual/14soul-en.pdf
Pay particular attention to 6-24 & 6-28
CAUTION - Automatic
transaxle
• If the car is being towed with
all four wheels on the ground,
it can be towed only from the
front. Be sure that the
transaxle is in neutral. Be sure
the steering is unlocked by
placing the ignition switch in
the ACC position. A driver
must be in the towed vehicle
to operate the steering and
brakes.
• To avoid serious damage to
the automatic transaxle, limit
the vehicle speed to 15 km/h
(10 mph) and drive less than
1.5 km (1 mile) when towing.
• Before towing, check the automatic
transaxle for fluid leaks
under your vehicle. If the automatic
transaxle fluid is leaking,
a flatbed equipment or
towing dolly must be used.
