I have to crawl under to see for myself, but is the mount and the subframe area need to be beefed up?
I did a ton of subframe beefing as I had a '96 Grand Cherokee with a huge custom lift and running 35's, built V8, Dana 44 and 60 axels w/ 4.11 gears & lockers and rock crawled the ISH outta it, and those aren't kind to a weenie unibody like a ZJ has.

Hmmmmm, I wonder if I produced a "bolt-on" brace/mount for big sway bars if anyone would want one

I'll have to check things out and come up with a design.