Although the Great Basin is relatively wide, the entire setup is still narrower than handlebars.
Surface of the Luggage rack remains free and it's possible to add a tail bag.
Adding Perun motoExtension platedoesn't influence fitment of the Great Basin bags. Upper straps still pass through the slots on Luggage rack.
Major advantage of using the Extension plate lies in larger surface. This makes installation of bigger capacity tail bags, or fuel/water bladders, more convenient. Giant loop Armadillo bag is a neat way to carry additional fuel or water.