I've got 265/75 x 16 BFG's on my standard 7" alloys. I have also fitted a Scorpion 2" lift with Koni shocks.
The only area that the tyres come into contact with the bodywork is the rear of the rear wheel arches.
The bracket that attaches the rear wing to the frame can be extended, allowing the tyre to clear inside the wheelarch, or a few minutes with a jigsaw or something similar can trim the bodywork back by about 1.5 - 2 inches at the bottom of the wing, tapering away back to the wheelarch lip at the bottom swage line.
Its called the Camel Trophy cut, as the Camel disco's had this modification...
I think Disco's definately look more in proportion with a slight lift and 265's...go for it