Custom Wheels & Tires Question

[mb0220]

Apologies if this or a similar question has already been asked...
Got my Lariate ER scheduled for prouction in Feb, but I'm already eager to see what I can be done with wheels and tires. This is what I have in mind in terms of size and dimensions:

Wheel: 20x9 with +18 offset
Tire: 285/60R20

Not trying to do anything wild. Just give it a better stance. My goal is a flush fit with the top of the wheel well, and I think the offset reduction (from +44 down to +18) along with the slightly wide tire should get me pretty close to the mark - probably even a teeny bit of poke, which is okay.

My big question is... will I have to modify the suspension with a level or lift in order for this to work?

Any folks with past insight (or a similar setup) would be appreciated!!

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[VTbuckeye]

I can snap a picture when I get home of some +18 wheels. I can't speak to suspension modification (these are 18s with winter tires 275 65 18 for my lariat).