The Marrakesh has the alternator plate which is what causes this whole problem in the first place. The rack mounts to the swing plate bolt which sits very high up, so the legs are shorter on the salsa specific racks. On top of that I believe they all do not come with the plate to allow fenders to be mounted, so you must buy this plate for another $60 (I know this to be true only on the fargo).
I really like the look and idea of the Marrakesh but I think the alternator plate is just screwing over salsa. I do not see this bike every being on par with a vaya for touring, commuting I think it will be just fine. It I do not think will have world presence like an LHT either.