Gddyup,
Right now i'm running Toyo M/T Tires LT275/65R20 126P E/10 on Stock Ford 20 inch rims with a Truxx Front Leveling Kit. Without the front leveling kit you will get rubbing with this tire size.
If you don't want to add a leveling kit, I would go with Tylus's suggestion. The tires that were used on the I Am Legend Expedition were the 33x12.50R20LT, Toyo Tires® Open Country M/T™ (Mud Terrain). They didn't use a lift or leveling kit.
Here is a link to IMCDb.org. You will find photos of the Expedition used in the movie.
IMCDb.org: 2007 Ford Expedition EL Limited Gen.3 [U354] in "I Am Legend, 2007"
Here are some photos of my Expedition that I posted on the forum
https://www.ford-trucks.com/forums/8...-equipped.html
Hope this helps,
- Robert