1. you secure your hitch pin to your ball mount.
2. your coupler is securely engaged to your hitch and safety latch is closed.
3. Pay special attention that your hitch ball properly matches the coupler size and the class rating of the hitch and that hitch ball meets or exceeds the class rating of the coupler.
4. Jack is fully cranked up (and parallel to tongue if swivel style).
5. Safety cables are properly attached in a criss-cross fashion.
6. The electrical plugs for lighting and brakes are connected to the vehicle electrical system.
7. Turn on your parking lights and emergency flashers. Walk around the trailer to be sure all lights are working.
8. If your trailer has brakes make sure fluid level is full in the actuator.
9. If your trailer has brakes, make sure you have not inadvertently pulled the emergency brake cable otherwise brake damage can occur.
10. Check your tire pressure. Adjust to manufacturer's recommendation on the tire. Be sure to check cold before towing.
11. If you have brakes, make sure your safety pin is securely placed.
12. Check bearings for proper lubrication. Check bearing cap for any damage.
13. Check lug nuts for proper torque! (90 pounds torque recommended.)