Widest Duster tire?
I run with the 275/60/15 on the rear wtih Super stock springs in stock locations. They were a little scary close to the upper quarter panel so I installed a set of good air shocks and bumped them up just enough to have nice clearance without scaring me. Works well and leaves a nice fat footprint.
-RPM
here you can see spring clearnces and check out those "C" body 11" finned drum brakes !