Also, if you're going to be thinking of a roof mounted system to haul your gear, check out these guys. Best prices I've found around. Better yet, you can CALL them on the TELEPHONE and get a real, honest-to-goodness small business owner who answers ALL your questions and walks you through every thing you need--with no attempt to upsell.
http://www.orsdirect.com/
http://www.orsdirect.com/