You'll find most people here aren't going to recommend anything over 1.25" Besides the issue with safety they create a noticeable gap between the bumpers and the body. They also do nothing more then allow a higher tire clearance, and therefore, you risk a higher chance of roll-over.
__________________ It's got a Willy's body, a Chevy engine, Ford axles, GM transmission, and Dodge steering components... it must be a Wrangler.
My Jeep had a 3" BL and 32" tires when I bought it. Other than looking janky I had no problems with rollovers and none of the 3" spacers ever broke. It actually handled great on corners as well. I replaced the 3" with a JKS 1.25" and 31" tires and it looks much, much better. I will go back to 32" tires sooner or later. Somewhere I had a thread with photos.