Hello Sepesce:
We're the ones who posted with the tandem hitch-mount rack. It's made by a company called ATOC (
Atoc - Draftmaster - Topper Racks). They make a hitch-mount rack called Draftmaster that can take up to 4 bikes - in any combination of singles or tandems.
We've been traveling with long bikes - various tandems and triples - for a while, and these have been the best racks we've come across. We have no relationship with the company other than as a customer.
-Andy