There are tons of threads on this already on the forum. So searching around will yield you many reviews and opinions on this.
It is easier to search via Google or Bing though than using the forum search.
Just make sure to include "4runner" and "5th" in your search along with other keywords.
Here is a link to one other thread which i saved though that has some good information but as mentioned above, there are many more that already exist on the forum.
20" Limited tire recommendations