Doug, you should also look into the max weight the VX roof rails are designed to support. Technically, my RTT could be attached to my VX as well. All you need are horizontal crossbars. The instructions for my tent recommend at least 3 crossbars, and the VX only has two. I also think that the tent, plus gear and two people might severely exceed the roof weight limits, so you might look into that as well. Personally, I don't really think the VX is a great platform for a RTT, but I have seen Mini Coopers and plenty of Subarus with RTTs.

Bart