I've been using TetherHorseToCart and it works just fine. But I need the horse back.

I can do it by disable and re-enabling the cart, but I'd like a solution that didn't flicker.

Anyone done this before?

I believe you can also disable/enable the horse to break the link, but that's the same problem. Looking at the CartAndHorseTether script that wraps the function, it looks like you also need to switch the cart between being key-frame controlled (static-ish) and Dynamic (meaning havok'ed and driven by the cart-horse bone link). Whether that part requires the cart to be disabled while it happens isn't clear. And I'm about to try doing this myself.

Flicker could be replaced by a fade, which might not look so bad if the horse and cart are separated more when they fade back in. It would be rather like the fade out when an NPC uses a load door.

Well, the horse in this case is the player, so I think I'm best off disabling the cart

Hmmm... The cart I'm using is summoned by spell, so having it disappear when the cart is dismissed isn't going to be a problem. Uncoupling in cases of violence or the cart rolling I can probably get away with it, since there's going to be other things going on. That only leaves the player uncoupling themselves temporarily. I suppose I can always hide that with quick fade to black and back

I think the idea of the keyframed motion is that it puts the handbrake on the cart. If you don't do that it'll roll back down the a hill given half a chance.

I wonder what happens if you leave the tether on and set it to keyframed anyway. Must try that; if it doesn't result in horrible death it could be quite useful