2000 Saab 9-3 Owner's Manual - Page 158

158 Starting and driving Trailer hitch load The weight distribution on the trailer makes a lot of difference to the handling properties of the car and trailer combination.With single-axle trailers, whenever possible, concentrate the load over the axle and keep it as low as possible. The trailer should be loaded so that the maximum load on the towbar ball is 5% to 7% of the trailer weight with a maximum permissible tongue weight of 165 lbs (75 kg). Note that this load must be added to the total load for the car. If this now exceeds the specified load capacity, the load in the trunk will have to be reduced by a corresponding amount. Driving with a roof rack load WARNING • A roof load will affect the car's center of gravity and aerodynamics. Be aware of this when cornering and driving in crosswinds. IB880 • Adjust your speed to the prevailing conditions. The maximum permissible roof load is 220 lbs (100 kg). Note that the roof load is included in the car's maximum permissible load (see page 221). Strong, sturdy roof carriers designed specially for the car are available from your Saab dealer. Always secure the roof load safely. Driving considerations Always take extra care when towing a trailer, as the car's handling will be different and its braking effect reduced. The trailer's braking system and suspension also have a considerable effect on these characteristics, see also "Driving with a load" page 160. If the car is equipped with automatic transmission, select position 1 when ascending or descending steep hills. Distribution of load in trailer a Light b Moderate c Heavy NOTE If the "Automatic transmission fault indicator" warning comes on, cease towing until the problem has been rectified.