The CO is still compressing the same if you went from 2 to 2.5". Call Fox and show them the pictures. You can address that with a bumptop extension which we dont have, hoping Fox could do something about it or you could add a 1/2" top spacer. Wolf makes one. But let Fox now about this.
To you give an idea
Bilstein 5100/6112 length are 22.08" extended, 16" compressed. This is stock strut length in the DT truck.
Fox 2.0 for your application are 22.79" extended, 17.39" compressed. Part# for your application is 985-02-136. They're almost 1.5 longer on compression and should be more than enough to keep 35's away from the fender lips.
Even if you got the 1500 DS Fox 2.0 Coilover by mistake 22.42" extended, 17" compressed they will still be 1" longer.