Surely there is someone out there carrying around surfboards on their Cayennes, eh guys? I am wondering what set-up you guys use on the roof. Do you use the Roof Rails with crossbars with a surfboard adapter or do you use the Roof Transport System with the Surboard Adapter? How many boards can you carry with either set-up? Is there a benefit for going one way rather than the other. Not worried about cost of either system.