Not sure how high my ramps are, but I can drive up them in low with the sway bar connected. That was when I was stock too.
Alot of people said they were having problems with the cables breaking in that link that KJ04 posted. They ended up making their own lanyard out of a steel cable with looped ends. I believe someone had a bracket bend after doing that though. So something must be getting hit to put pressure on the sway bar.

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LOST KJ'S
Where are you going???
Current Jeep: 2004 Jeep Liberty
-Atlantic Blue
-Air Ride Rear Suspension ; OME/Rustys Lift ; Powertrax Locker ; Moog Lower Ball-Joints ; 245/70/16 Yokohama Geolander A/T-S's on MOABS ; Flowmaster 50 SUV
Lost #007082
http://www.cardomain.com/id/jeepjeepster