You should always attach chains between your vehicle and your trailer. Cross the safety chains under the tongue of the trailer so that the tongue will not drop to the road if it becomes separated from the hitch.
Instructions about safety chains may be provided by the hitch manufacturer or by the trailer manufacturer. Follow the manufacturer’s recommendation for attaching safety chains. Always leave just enough slack so you can turn with your trailer. And, never allow safety chains to drag on the ground.
Hitches
Trailer brakesKia Cee'd JD Service Manual: Specifications
Specifications
IMS Electrical System
Item
Specification
Rating voltage
DC 12V
Operating voltage
DC 9V ~ 16V
Operating temperature
-30°C ~ +80°C
...
: Engine Block Heater
(If Equipped)
Engine Block Heater Precautions
WARNING: Failure to follow engine
block heater instructions could result in
property damage or serious personal
injury.
WARNING: Do not use your heater
with ungrounded electrical systems or
two-pronged adapters. There is a risk of
electrical shock. ...