I am thinking of lifting my 2013X 2.5" in the front and 2 " in the back. Front using a spacer on te strut. back is where I am having questions. 1) Block or Shackles? 2) Which are easier to install? 3) I have seen that both have pros and cons but not really understanding. Help.? 4) Finally if I do the lift of 2.5 in the front will I still need to do the "melt method" on the inner fender to accommodate a 285/75/R16? Thank you. Henry