Ezekiel Guidry

Z from Southern Idaho here I just got a 2017 GMC Sierra single cab V6 2WD 8ft bed with twenties and a lift OR leveling kit I already tapped into the factory speakers to install a line out converter and subs I'm ordering wheel spacers in a day or two I'm jumping straight to 4 inches? Will it rub more than a little bit? Is 88 inches too wide? Is the clearance worth losing the fuel efficiency if these are way too heavy to even function