You're likely to rub with spacers on the mud flap even with stock wheels/tires. I just drilled two holes in my mud flap and ran a black zip-tie through them and around the frame rail behind it to hold it back. Got rid of my rubbing. Since you have a TRD Pro, the fender liner should already be pushed forward since they do that at the port when it gets off the ship for Pros.

I get a little shimmy between 55 and 65 mph even with the TRDOR wheels. It's not just a skinny wheel thing. Small balancing issues definitely get more pronounced with wheel spacers.


edit: whoops, just realized this thread is about suspension spacers, not wheel spacers.