On a 2-3 lift, 33's shouldn't rub the body mount, they will most likely rub the front and back on your fenders. I didn't have to trim my body mounts until I went to 35's on my 04, but for peace of mind you COULD do it now.
Wheel spacers (I run 1.5") shouldn't make you rub the body mount either. Again, I was fine until 35's with high offset wheels and spacers. At that point I rubbed the frame on the front, wheel well on the back (I recommend you fold over/grind down that pinch weld), and body mount.
There are some nice steel weld-on options for the body mount chop as it is pretty popular if you decide to go that route!