bottom line: i need a slight pull.

i'm told that pulling the rear QP on my lexus is not gonna be so easy because of the double sheetmetal, and how thick the metal is. So i was thinking of doing some slight trimming of my rear fenders(which are currently rolled flat btw). Some people say don't do it because my QPs will warp, some say go for it just be careful with it. :think:

i just need a slight pull, like half an inch or so, nothing too crazy.

any advice/feedback/suggestions much appreciated...