Haha, had a similar exp with a the first horse my daughter leased, later sold to a friend at the same barn. He was very familiar with my trailer as we took both girls and horses to many 4-H and open shows, but otherwise was a bad loader.
The new owner (after a couple of years) took him to a rodeo in a different trailer to barrel race. He would not get in the trailer to come home.
Desperate they called me very, very late. I took our trailer and he about jumped on. Guess to him it looked like 'home'.