Wife and I recently purchased a Trek T-900 tandem. She has an OSI spare tire rack on her RAV4. It works fine with the tandem. We find the balance point and clamp the bike there. I have a SARIS hitch rack for my PT Cruiser. It can't handle the tandem. Even with the new "bat wings"' the bike torques around the tube. I've called a tandem specilty store and the only recommend the Draftmaster. Due to limited range of motion with one arm, I can't use a roof rack. I've seen hitch racks with twin arms that range from about $70 for a Bell rack to $180 for a Thule all the way up to $500+ for the Draftmaster.
Wife and I recently purchased a Trek T-900 tandem. She has an OSI spare tire rack on her RAV4. It works fine with the tandem. We find the balance point and clamp the bike there. I have a SARIS hitch rack for my PT Cruiser. It can't handle the tandem.
We use a hitch rack that supports the tires, but for our tandem we had to make an "extension" for one side that the fork bolts into (we remove the front tire to make it shorter, and turn the forks backwards).
At a bike rally we once came across, I took the time to ride around in the parking lot to see how other's had mounted thier tandems and it appeared that all the hitch racks were modified in some way to work.
That aside, tandeming is great fun. If you haven't done so already, I'd recommend reading the article "the stoker makes no mistakes", URL is below.
