I know alot of people have had the same problem so here it is. Recently I've been trying to create what I consider to be the ultimate save (360). In doing so I came across the code to add the spectral horse(ragnar the reds) to my save. The only problem is that while he still fast travels with me, and "parks" at stables. He likes to wander off whenever I dismount anywhere in the field. So upon exiting the cave, ruin or what ever I have to fast travel to get him back. I've been looking into this issue and setownership doesn't work. The two remaning options I'm considering are addfac and tai. If anyone knows
the details of these two functions feedback would be appreicated. Primarily if you toggle the ai on a horse does he still fast travel with you or is the travel script attached to the ai? I know it's possible to get this horse to behave somehow because I've seen other saves that he stays put where you left him.