I'd bypass the crossbars altogether, attach directly to the side rails if possible.. I know some rtt's require horizontal bars though.
JSparky - Thank you so much! This picture is exactly the confirmation I was looking for. I just bought an Autana, and need to go pick it up. Planning on assembling and mounting it in their parking lot... Question: Are those the original bolts, and did you have to cut them? It looks like they need to be a pretty exact length so as not to hit the roof.
