Lincoln 2015 NAVIGATOR Owner's Manual page 229

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Once the trailer is level or slightly nose down toward the vehicle:
• Lock the bar tension adjuster in place.
• Check that the trailer tongue securely attaches and locks onto the
hitch.
• Install safety chains, lighting, and trailer brake controls as required by
law or the trailer manufacturer.
Weight-distributing Hitch – Vehicles with Automatic Leveling
Suspension
WARNING: Do not adjust a weight-distributing hitch to any
position where the rear bumper of the vehicle is higher than it
was before attaching the trailer. Doing so will defeat the function of the
weight-distributing hitch, which may cause unpredictable handling, and
could result in serious personal injury.
Note: If you do not move the loaded vehicle for approximately 12 hours,
the leveling system may bleed down to a lower height. This can be
especially apparent if you leave a trailer attached to the parked vehicle
for long periods. You must drive your vehicle in order to re-level the
suspension.
When connecting a trailer to a vehicle with automatic leveling suspension
using a weight-distributing hitch, always use the following procedure:
1. Load the interior of the vehicle to a weight similar to that which you
intend to carry when towing. This includes things such as passenger
weight and cargo.
2. Drive the vehicle for approximately 2 miles (3 kilometers) to re-level
the suspension.
3. Park your vehicle, without the trailer, on a level surface.
4. Measure the height to the top of your vehicle's front wheel opening
on the fender. This is H1.
5. Attach the trailer to your vehicle without the weight-distributing bars
connected.
6. Make sure you securely attach and lock the trailer tongue to the
hitch.
7. Install safety chains, lighting, and trailer brake controls as required
by law or the trailer manufacturer.
8. Drive the vehicle and trailer at 20–25 mph (32–40 km/h) for
approximately 2 miles (3 kilometers) to re-level the suspension.
9. Park your vehicle and trailer on a level surface.
10. Measure the height to the top of your vehicles front wheel opening
on the fender a second time. This is H2.
Towing
I n f o r ma t i o n P r o v i d e d b y :