I'll throw in my 2 cents. Teach the horse to lead off of all four feet. Get a soft lariat or a cotton rope, 30 feet or so. Catch the left hind hock, wear gloves, and stand in back of the horse. No halters or any restraint on the head. Pull on the rope and hold it until the horse gives you the left foot. Immediately release. Pull again until you get the foot once again. Release with compliance. When the horse is leading backwards off of the left hind foot, with you directly in back, then move to the right front and repeat the same process. Then the right rear and finally the left front. When you're done the horse will lead off of any foot. Next, as long as you've got the rope, tie off a bowlin knot at the neck. Spin the rope over the horses back, under the tail, under the flanks, and then tangle him up with it, however you can think of. All of this teaches the horse to give to pressure. I'm not sure how it might work with a horse that's gotten away with not loading for some time, but it sure works with a colt. After doing the above, I've never had any problem loading or with pullbacks when the horse is tied. Finally, if the horse ever gets into the wire he'll be much more likely to stand until rescued and not struggle and hurt himself. Finally, if you know someone with a stock trailer, a horse will generally be more willing to step inside because there is more room. Once he's got the hang of it it's lots easier into a slant load. Good Luck
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