2018 Tundra Rim Question

I have a SR5 with a rough country front level kit and am interested in putting the KMC Grenade OR 18" wheels on it. Tire dealership indicated they don't fit, but KMC says they will as long as it's leveled or lifted? Mine is only leveled in the front and I'm wondering if these will work. Is anyone running these wheels on a setup similar to mine?

 

Wheel size shouldn't matter. Just as long as your offset matches the factory offset or is greater ( More offset will place a higher load on your wheel bearings causing premature ware). But 20" wheels will fit.

 

Thanks Vector, I would like to use the 18" if I can. The 18" KMC Grenades have a 0mm offset, stock is 60mm. I am currently running rims that have a 25mm offset. That a problem, sorry not real familiar with offsets?