On my 2018 Pro early on, I had a 1.5” Cornfed spacer up front and 1” rear. Ran 285/70-17’s with everything else being stock. Pros have the port front fender trim and I even left my front mud flaps on. Only very, very slight rubbing on max articulation. i.e.; my avatar. Of course, get a new alignment and see how much positive caster they can get out of the stock UCA’s. Then you can leave your mud flaps. You should have no issues.