The roll angle does change in offcamber situations but as always it depends on what you have in the truck.
With sway bars on, the compound compression rate (spring plus effective rate of roll bar) are combined. So it's like having a stiffer spring. Hence the rollover centre is changed. Once you remove the sway bar, it's like going to a softer spring. So basically the down hill spring will compress easier as the rate of compression is smaller (sway removed).
For offroad, and depending on the terrain I would disconnect both. It gives you a more balanced truck. If the terrain calls for a lot of offcamber situations, just reconnect them.
My previous ride was a lifted 4doorJK Rubicon on 34's. The things was a tractor! But the first thing I did was remove the rear track bar. Since the Rubi has electronic disconnect, it was very convenient to connect or reconnect the front depending on terrain.
My current vehicule is 2000 Disco II comes with ACE and air suspension in rear. I know there are a lot of problems with these but I love it especially with ACE. You get race car handling with ACE on any speeds over 40 kph. Virtually no lean!
Now when you go offroad the systems allows very good articulation, and apparently it has accelerometres that measure roll over, even at slow speeds and adjust the sway bars to prevent vehicule from flipping over. I have not tried this feature yet.
So on this vehicule, I'm keeping everything connected, but just for convenience.
