Towing a trailer with ease and safety requires a certain amount of experience. It's a good idea to learn the feel of a trailer by practicing turning, stopping and backing in an open area such as an empty parking lot to gain experience in handling the extra weight and length of the trailer. Take enough time to get the feel of the vehicle/trailer combination under a variety of situations.
Skillful backing requires practice. Back up slowly with an assistant acting as a guide and watching for obstructions. Make small corrections, instead of exaggerated ones, as a slight movement of the steering wheel will result in a much larger movement of the rear of the trailer.
Allow considerable more room for stopping when a trailer is attached to the vehicle. Keep in mind, the car/trailer combination is a considerable increase in the weight that your car's brakes have to bring to a stop. If you have a manual brake controller, lead with the trailer brakes when approaching a stop. Trailer brakes are also handy for correcting side sway. Apply the trailer brakes for a moment without using your vehicle brakes; the trailer should track straight again.
Check everything before starting out on the road, then stop after you've traveled about 50 miles and double-check the trailer hitch and electrical connections to make sure everything is still secured. Listen for sounds like chains dragging on the ground (indicating that a safety chain has come loose) and check your rear view mirrors frequently to make sure the trailer is tracking properly.
Remember that a car/trailer combination is more sensitive to cross winds; slow down when crossing bridges or wide open expanses in gusty wind conditions. Exceeding the speed limit while towing a trailer is not only illegal, it is foolhardy and invites disaster. A strong gust of wind can send a speeding car/trailer combination out of control.
Because the trailer wheels are closer than the towing vehicle wheels to the inside of a turn, drive slightly beyond the normal turning point when negotiating a sharp turn at a corner. Allow extra distance for passing other vehicles and downshift if necessary for better acceleration. Allow at least the equivalent of one vehicle and trailer length combined for each 10 mph of road speed.
Finally, remember to check the height of the loaded car/trailer, allowing for luggage racks, antenna, etc. mounted on the roof and take note of low bridges or parking garage clearances.