1. Make sure your tow vehicle and trailer do not need maintenance of any type. Check and correct tire pressure on the tow vehicle, trailer, and spare tire. Check wheels, lug nuts and bearings.
2. Check your hitch, distribution bars and sway bar and make sure they are secured and adjusted. Something as simple as a pin left out of the sway bar can greatly influence a trip when you lose the sway bar on the road (sounds like this happened to me, doesn't it?). My Dad taught me early on to crisscross the safety chains, making sure they have enough slack to make turns but not touching the road. Check that the breakaway system is connect to the tow vehicle, but NOT to the chains or ball mount.
3. Same goes with the trailer wiring hookup - loose enough to turn, but not slack enough to drag the ground.
4. Check all the exterior lights, ensuring that brake lights, turn signals and all running lights are functional. Check your side
5. Check that all interior items of the trailer are secure. Leaving a free standing TV on the counter and unsecured might leave you with a banged up TV and cabinet (again, does this sound familiar????)