Here are some important points if you decide to pull a trailer:

M/T : Manual transaxle
A/T : Automatic transaxle
DCT : Dual clutch transmission
Maintenance when trailer towing
Weight of the trailer: Manually Opening the Fuel Filler Door - Hybrid Electric Vehicle
(HEV)/Plug-In Hybrid Electric Vehicle (PHEV)
WARNING: The fuel system may
be under pressure. If you hear a hissing
sound near the fuel filler inlet, do not
refuel until the sound stops. Otherwise,
fuel may spray out, which could cause
serious personal injury.
Note:The transmission must be in park (P)
or neutral (N).
When using the manual ...
Kia Cee'd JD Service Manual: Troubleshooting
Troubleshooting
Trouble Symptom
Probable cause
Remedy
Vehicle pulls to one side
Scoring of driveshaft ball joint
Replace
Wear, rattle or scoring of wheel bearing
Replace ...