I am an LC100 guy that purchased my son a 2012 4Runner limited that has 20's on from the factory. I like a taller side wall and would like to go to a 17-18" wheel. How small can we go and still clear the breaks? Also, what is the offset on the factory wheels? He would like a little tire sticking out of the fenders like my truck. I run SCS F5 wheels on my 100 with -10 offset. What can I get away with on the 4Runner?