I'm running 1.5 Spidertrax and have done quite a bit of off-roading with no negative issues thus far. I check my wheel torque frequently and when I rotate my tires every oil change, I double check the spacer torque.
Some updated pics of my WK. Sorry, weather has been crappy today. I'm going to get rid of the 33's and go back down to 265/70's or 255/75's. I don't want to trim the hell out of my fenders and I was happy with the look of the 32's.
Here's how it sits currently: