First read and observe the introductory information
and safety warnings 
Headlight adjustment
Towing a trailer can raise the front end of the vehicle enough for the dipped beam to blind other road users. Use the headlight range control to lower the light cone as required. If you do not have headlight range control, the headlights should be adjusted by a qualified workshop. Vehicles with gas discharge bulbs adjust automatically and do not require manual adjustment.
Things to note when driving with a trailer
Pulling off on slopes when towing a trailer
Depending on the steepness of the slope and the total weight of the trailer and vehicle, a parked vehicle towing a trailer can roll back a short distance when pulling away on a hill.
When towing a trailer, pull off on slopes as follows:
once to switch off the electronic
parking brake   .
button and hold it in this position
to hold the vehicle and trailer with the electronic parking brake.
button when the engine
has sufficient power to move off. 
WARNING
Loading the trailer
Trailer stabilisationChecklist for evaluating running gear on accident vehicles
Damage to running gear may go unnoticed during repairs to
load-bearing and suspension parts of accident vehicles. Under
certain circumstances, this undiscovered damage could lead to
serious consequential damage during later vehicle operation.
Therefore, ...
Removing and installing headlight range control unit -J431-/control unit for
cornering light and headlight range control -J745-, RHD vehicles
Note
When renewing the control unit, select
Renew function for the respective control unit in
Guided fault finding or
Guided functions mode
→ Vehicle
diagnostic tester.
Removing
â ...
Removing and installing bulbs for cornering light -L148-/-L149-
Note
Left cornering light bulb -L148- and right cornering light
bulb -L149- are only fitted on gas discharge headlights.
Removal and installation are described for the left side.
Removal and installation on the right ...