Mercedes-Benz GL-Class 2014 Owners Manual - Manual (Page 458)

Trailer tow hitch
Mounting dimensions
! If you have a trailer tow hitch retrofitted,
changes to the cooling system and drive
train may be necessary, depending on the
vehicle type.
If you have a trailer tow hitch retrofitted,
observe the anchorage points on the
chassis frame.
Anchorage points for the trailer tow hitch
(example)
:
Anchorage points
; Rear axle center line
456
Trailer tow hitch
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