actually Alex, it turns out that since you have the Se/SC that means that you most likely have the 17" SC rims. The stock tire size for that rim is a 265/65/17.

This equals out to 30.5629

That is really close to 31". As a matter of fact, you have to split the difference in two for the top and bottom. and you are only going to gain .2" roughly in height. Coincidentally, that is how much less room will now be there between your fenders and your tire.

With this tire size I do not think that you are going to have to do any trimming.

If you need some help with tire sizes let me know.