I’m really out of the loop. Broke and trained Standardbreds at the track for years. 90% of them could be “hooked” solo, and there were only a few that wouldn’t stand while being checked up. As long as you didn’t check them up, honestly, you could walk back over to the shed row, get your helmet and sunglasses, walk back over, pick up your lines and jump in the cart. Now to the race bike, we did check them up going to race, but the overcheck was usually much higher, easier to have the driver in the bike and the groom check them up. But we hooked them solo, in a piddly little set of cross ties, in a tiny little open fronted stall, next to 10 other horses, surrounded by all kinds of commotion. then just walked beside them til the driver was up. These horses would stand, for the most part quietly, in cross ties forever. But unless it’s a fancy rig, or multiple horses, I can’t understand why a well trained harness horse wouldn’t just stand still. I am not talking hackney show ponies or saddlebreds here, I’m talking the pleasure driving and cross country, obstacle types. Any horse can be taught to stand if one takes enough time, and I’m pretty sure that if you couldn’t teach him to stand still, unless he made me a pile of money at the track, I’m not real interested in sitting behind him. I think if you are at the horse’s home base, the place he’s used to, unless you’re hooking a team, or a greenie, he should stand til you tell him to move off. I have a nearly 18 hand draft cross (very green) that I have to mount from a mounting platform. He’s coming 7. I got him as an unbroken 3 yr old. His first lesson was “stand”. His second lesson was “whoa”. Whoa means “now, I mean it, move another toe and die big boy”. Armed with stand and then whoa, we have no problems at all, Nor did any of the babies I trained for the track. Left and right are the easy things, Go is pretty easy to encourage. Whoa is the most important gait, no matter what the discipline. Of course it’s much more fun to work on the other stuff first, which is why folks have trouble later on.