Well, Silvermoon is the only one with Teleport, I think, and she can only take three others with her... then the horses... would take a lot of teleports to get everyone there, more than she could cast in a day. And I also don't even know, whether she knows a location in the vincinity. Surely not so well to have a very high chance of success, so failures need to be considered as well, which soak up even more spells.
Having another mount for Granites 'stuff'

is no problem, tho.
Just noticed, that a mule has only a 30' base speed.
That would increase our travel time to about 13h.
Ah, wait... Louella is a warbeast, so it's 40'.
Still 9h then, but that's probably ok as travel time (13h seems a bit much).
Of course, Louella could also
hustle for more than one hour and thereby keeping up with the 60' pace of the riding horses.
So getting some of the stuff on another horse should allow for an acceptable speed.
Bye
Thanee
P.S. How did you get to Granite's base speed? I just wondered, since I would only get to 40' (20' dwarf +20' monk +0' drunken master)... Hmm... anything I have missed there?