Just an observation:
After I lifted my Trackick, three others locally did thiers as well. Two are running 245R75 16 and one is running 30x9.50 15. All are clearing fine with stock bumpers and no fender trimming. Stock rims.
However, they have the newer Trackick bumpers that came out some where around 95'
Also we're all running the 3 inch Calmini suspension lifts only.
I'm running 31x10.50's on 15X8 rims and rubbed eveywhere until I started removing bumpers and moving things running gear to the edges.