Thor Motor Coach Class B+ Owner's Manual page 37

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Always use safety chains between the motorhome and the towed trailer or vehicle.
Cross chains under the trailer tongue and allow slack for turning corners. Connect
safety chains to the trailer or vehicle frame or hook retainers. Never attach chains to
the bumper of a vehicle.
Tow bars or car dollies generally are made to travel in a forward direction only. Most
towing equipment of this type is not designed for backing. Never attempt short back
up distances with a tow bar or tow dolly. Damage to the motorhome, towed vehicle
or towing device will result.
Note:
Thor Motor Coach accepts no responsibility for damage to the
chassis and other components resulting from towing loads
greater than its designated class specifications. Also consider
the gross combined weight rating of the motorhome before
towing a trailer or vehicle. Towing an object such as a boat and
trailer or a vehicle behind the motorhome results in added
driving considerations that you must contend with.
THE Motorhome FULLY LOADED AND THE TRAILER,
OR TOWED VEHICLE, MUST NOT EXCEED THE
Motorhome CHASSIS' GROSS COMBINED WEIGHT
RATING (GCWR). Consult with your selling dealer to
determine the GCWR of the motorhome. Do not exceed
the motorhome gross combined weight rating (GCWR)
or the hitch rating. The tongue weight, the weight
pushing down on the hitch, must not exceed
10% of the hitch capacity.
DO NOT TOW LOADS THAT EXCEED THE GROSS
COMBINED VEHICLE WEIGHT RATING OR OTHER
TOW RATINGS OF THIS MOTORHOME.
THE DESIGNATED HITCH RATING MAY EXCEED THE
GCWR OR OTHER TOWING CAPACITY LIMITS OF THE
MOTORHOME. It is your responsibility to properly
load the motorhome, while staying within the tow
ratings, gross combined and gross vehicle weight
ratings.