Normally I take my time teaching a horse to lode, and it normally takes under a day for him to learn and get comfortable with getting on and off the trailer. I will let his back out as much as he wishes, and walk him around and try again until he walks on in.
However, there are times in which the time available to take you time does not exist. Like in this case, the new owners wanted get on home, and Spooky had never laded into a tag along tracer and was reluctant to load.
This video, shot in one clip, demonstrates how to load a reluctant horse with little fuss and no muss in under 6 minutes.