2012 Buick Enclave Owner's Manual - Page 308

9-54 Driving and Operating Maintenance When Trailer Towing The vehicle needs service more often when pulling a trailer. See Maintenance Schedule on page 11‑2. Things that are especially important in trailer operation are automatic transmission fluid, engine oil, axle lubricant, belts, cooling system and brake system. Inspect these before and during the trip. Check periodically to see that all hitch nuts and bolts are tight. Trailer Towing Three important considerations have to do with weight: ... The weight of the trailer The weight of the trailer tongue The total weight on the vehicle's tires Maximum trailer weight is calculated assuming only the driver is in the tow vehicle and it has all the required trailering equipment. The weight of additional optional equipment, passengers and cargo in the tow vehicle must be subtracted from the maximum trailer weight. Use the following chart to determine how much the vehicle can weigh, based upon the vehicle model and options. Weight of the Trailer How heavy can a trailer safely be? Speed, altitude, road grades, outside temperature, special equipment, and the amount of tongue weight the vehicle can carry must be considered. See "Weight of the Trailer Tongue" later in this section for more information. Engine Cooling When Trailer Towing The cooling system may temporarily overheat during severe operating conditions. See Engine Overheating on page 10‑18.