you don't say what the factory rack system is...Thule or Yakima?
I'm a big fan of saddles....as they don't take up as much overhead space so less snagging tree branches when getting to the put-in. Haven't dealt with the J-bars.
I use the Thule kayak saddles and find them well-made, although the strap DOES tend to wear through the strap-channel on the saddle after a number of years of hard use...it took 6 years of solid use for me for that to happen....maybe yakima is the same way.
With saddles, you won't need any bow/stern lines at all. The saddles hold the 'yak VERY securely after strapping down the rachet straps.

EDIT: Yes you CAN get two kayaks on one factory rack system....you just need to get the extended cross-bars...Thule has them available for not much more...and I would presume that Yakima sells extra-long crossbars, as well.
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Last edited by Alaskan Rover; 03-23-2012 at 04:49 PM.
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