unhittable

I have a 2015 XLT, 4x4, 2.7L with 3.73. Iam looking to add some new wheels and tires to it and have decided on getting some BFG KO2 275/70/18 with Fuel Pump 18x9 wheels (+1 offset).

Would these be fine at stock height or should it be leveled/lifted?

Tires/Wheels:
http://www.4wheelparts.com/Wheels/D5...Offroad+Wheels
http://www.4wheelparts.com/Tires/LT2...&t_pn=BFG80867

Shocks if needed:
http://www.4wheelparts.com/Suspensio...=FOX985-02-015
http://www.4wheelparts.com/Suspensio...=FOX985-24-029


Any help would be great. I am also open to suggestions

Last thing....Wher would be the best place, pricing wise, in Canada??