They've been doing it for years. If you ask, most of the time they will put a halter on the horse for you(your halter). You HAVE to have a closed trailer usually too! So not open back half window.. you can rig a cover.
They need some work, the younger the easier to work with. They are usually smaller animals, but tough rugged horses, great for trail riding.
Sometimes they pair up with PMU foal organizations too, and you can get half drafts, or paints, or appaloosas too.
Always a cool thing to check out if nothing else!