2010 GMC Terrain Owner's Manual - Page 270

8-62 Driving and Operating Maintenance When Trailer Towing The vehicle needs service more often when pulling a trailer. See this manual's Maintenance Schedule or Index for more information. 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. Leaving After Parking on a Hill 1. Apply and hold the brake pedal. 2. Start the engine. 3. Shift into a gear. 4. Release the parking brake. 5. Let up on the brake pedal. 6. Drive slowly until the trailer is clear of the chocks. 7. Stop and have someone pick up and store the chocks. Engine Cooling When Trailer Towing The cooling system may temporarily overheat during severe operating conditions. See Engine Overheating on page 9‑20. Trailer Towing Before pulling a trailer, there are three important considerations that have to do with weight: ... The weight of the trailer The weight of the trailer tongue The total weight on the vehicle's tires