The higher cog will increase not decrease your tendency to roll...
Like was mentioned the main disadvantage to a sway bar is high speed cornering and low speed rock crawling... on road having it has not disadvantage...
Of note sway bars do not generally limit travel they limit articulation. You are going to have 11 inches of travel with it there or not... but with it on you cannot get one wheel to hang whilst the other one gets shoved into a wheel well... or to put it another way... a hit to one wheel will cause less wheel travel with a sway bar... a hit to both wheels simultaneously is largely unaffected.
I really have no idea what you are trying to say
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Im going to "attempt" to respond.
Yes the COG will increase your tendency to roll, but this truck is not the height of a F250 with a 10 inch lift on it. So for you to roll you will need to be driving like a complete idiot or roll a bead, either way your screwed
If you are limiting articulation, aren't you limiting your travel? Limiting your articulation will stop your front end from dropping out, which is limiting your travel.
Then again I'm no expect in sway bars, I've never run one on any of my trucks