I've been looking at the same wheel/tire combo for the rear. Many people have run a 285/30 or even a 295/30 on a 10" wheel with a +40 to +45 offset. Running a 295 tire on a 10" wheel brings up the same fitment issues as running it on the correct 10.5" width wheel but offset would need to be almost perfect. I came up with 45-50 offset on a 10.5" wheel with +48 being ideal and running a 295/30/18 tire rolling the rear qtrs