I've put a a good 300 lbs on two load bars with the high rise towers
and had no problem. Did it many times. Without the towers it will be
more stable, but you have better chances of scratching the roof and
mounting will be more difficult due to clearance between roof and
rack. This will also make it more of a pain to sling straps under
there when you need to.
I don't know what the gutter mounted Yakima is rated for. You should
ck with them. Then do a good, real world estimate of what weight you
will actually carry up there.
If memory serves me, I think the double, gutter mounted load bars are
good for 250lbs...but memory rarely serves me!
Miguel

On Fri, Aug 21, 2009 at 9:18 AM, Michael Sullivan<sandwichhead@gmail.com> wrote:
> Please see the load bars installed yesterday.  I know I could use a hi-rise
> attachment to get them a little higher, but I have a chance to get another
> set just like these for cheap.  Advice if more than two are needed.  I have
> a 14 ft sit-in freshwater molded kayak.  May want to mount a cargo box or
> bike carrier also.  Thanks.
> http://picasaweb.google.com/sandwichhead/RoofRack08212009?authkey=Gv1sRgCP3GtJaChr30nAE&feat=directlink
> Michael in San Antonio
> 91GL AT 'Gringo'
> 73 Beetle
>