[QUOTE=matryoshka;3979613]
it really helps to not allow them to turn their head away–I like to have their heads toward/in the trailer no matter what the feet are doing.[/QUOTE]
Yes, their eyes/brain/focus needs to stay inside the trailer. At first with a new loader, I give them time to look, sniff, nibble their way up the ramp, etc. until they are pretty relaxed around it. Many will be all the way in just fine during that time. The real “I don’t have to” often comes 3/4/8 rides later, because they have never really been “trained” to load, and one day it dawns on them that they are no longer curious, and now they would rather not.
Then I just do what ever it takes to get them to move their feet when I say. I don’t care if they take a step, and go right back, but when I say move, they need to move. If they get rude with their front end and refuse to look in the trailer, that is when I add a chain.
I lightly annoy/irritate them by doing tiny nudges on their halter/rope to ask them to go in, and annoy/irritate them behind to ask them to move their feet (sometimes sideways a step and back is ok, but they have to move when you say to.) I do not get worried or upset if they take steps forward 100 times, and go right back 100 too. But neither do I give them a break - especially not if they get upset, because that is when they are CLOSE to going, “ok, FINE!”, and going on.
Most horses will soon realize that it is a lot more comfortable, and calm inside, than the repeated demands to move when outside.