2. Cross the safety chains and secure the coupler
Do this so you'll make sure your trailer stays connected to your car throughout the trip. Even if you're simply driving around the corner, don't skip this step.
To begin, make sure the coupler is securely latched and locked, so your trailer is properly coupled to your tow vehicle. Then, for a bumper pull or on either side of a gooseneck, connect the safety chains that dangle under the coupler. In the event that the trailer detaches from the coupler, these safety chains are your emergency backup.
Cross the safety chains under the coupler with a bumper pull so they can grab the tongue should it slip out. If you don't do this, it would fall to the ground and crash.
3. Check your trailer electrics and brakes
When you connect a trailer to your tow vehicle, it shares responsibility for signaling and braking. Before you leave, double-check that your trailer's turn signals, emergency lights, and brake lights are all working properly.
Before driving a trailer with electronic brakes, make sure the batteries are fully charged. You should also have a brake controller. The controller's instructions in the owner's manual will tell you how to check that it's adjusted and working properly. Finally, once you've finished reading these trailer towing safety recommendations and are ready to get on the road, take your trailer for a brief test drive to double-check brake function.