OK - so 265/65/17 is stock size for the SE, which calculates to 30.6" tall
265/65/16 is stock for the Pro4X, which calculates to 31.6" tall
285/70/17 comes out to 32.7"
And of course different brands vary within those specs, sometimes significantly.
So you're looking at 2" larger diameter - my guess is the tire will fit the rim, but I don't know about it fitting the fender. I THINK there's a real risk of negating any clearance issues you might get (which is 1") with fender rub, even with the melt mod. I have stock 265/65/17 Duratracs on my SE, and they fit the fenders nicely. Pulling the running boards and mudflaps off is a fast and cheap way to fix the visual perspective - I've found these trucks look an inch or so higher once you do that.
Traditional wisdom is to run what you have until you hit it's limits, but we all do stuff just because we want to as well, so I'm not trying to talk you out of a lift, just throwing some ideas out there.
Do you have a relationship with a local tire store? I know, weird question - but I've been going to the same Discount Tire for almost 20 years, even though they've opened a closer location during that time, I still drive to my original one. The people change, but the management and the computer doesn't. These guys have test fit tires on many different vehicles for me, I usually try to go on random weekday afternoons when they aren't too busy - I've even had them order in tires for the test fit - and they never charge me for this stuff. They know I'm eventually going to buy 4 of whatever we decide on. So that's how I usually decide what to do in these situations.
Good luck, and post up pictures when you decide!