This is the first four minutes of our practice today. The whole session lasted 30 minutes and he got on the trailer a total of six times.
This clip shows my closing and latching the trailer door and his waiting (almost) for the cue to back off.
In all of the mini-sessions today, I practiced his waiting for the backing cue. Sometimes he did wait and sometimes he didn’t. Once he even ignored the back cue three times so I gave up asking him to back.
On the fifth load, he didn’t stay on long and got off to eat grass. I think he may have been done for the day. I let he graze for a bit, then I asked him to get back on and he did and played the game for another 7 minutes!