I have a 2004 Land Rover Discovery with...
I have a 2004 Land Rover Discovery with no roof rack system, just the bars down each side and a rain guard. Which rack system do I want and would the BigStack be good for hauling two Kayaks?
Check the "fit my car" link at http://www.yakima.com/ to see what options you have for your base rack system.
This option would definitely allow you to fit 2 boats on top of your vehicle. However, I must point out that this will be about the most difficult setup to load (since you must lift the boats to the center of the vehicle). And also, I would only use this setup for short carries because of how the boats rest directly on the bars. I break the rules and allow my boat to stay on top of my vehicle for days at a time, so I wouldn't dream of having it not cradled in something like a Hullraiser or Bowdown. But like I said, that's just me. Check my response to your other question for some options concerning carrying 2 boats. Good luck! Oh, and if Phil beat me to the answer while I was typing out this book, you can listen to what he has to say. He seems to know what he is talking about ;-)
Haha Phil, you buttnugget! Made me really work for that one!! Yeah, so neither Yakima nor Thule give dimensions for crossbars in their vehicle fit tools. I guess they figure all Discovery's have factory crossbars and that no one would ever want to upgrade them. Well after about 20 minutes worth of google-digging so as not to lose face, I found this link:
If you scroll nearly to the bottom, the guy states that 50" thule bars fit nearly perfectly (see his pictures). So that being said, in Yakima I would suggest going with Railgrabs and 58" crossbars. Allowing for 4" of overhang each side to tie straps to or sawing them down a few inches for a cleaner look if necessary.
Hope this helps! Thanks Phil :-P Haha