Getting New Wheels, Which Offset?

[usmc3529]

Right now I have the kmc spy 18x8.5 +18 offset on my truck (o7 silvy 1500 6 in lift) the wheels are corroding horribly so I am taking them back to discount tire.

 

Im going to go with a matte black wheel, the kmc rockstar which is 18x9 and 0 offset with a backspacing of 5

 

I have 295/70/18 in nitto trail grapplers. Im kind of dumb at wheel sizes but im assuming this offset will stick out about 3/4 of an inch more than the ones I have now. I was also told that it would be better recommended for me to have an 18X9 wheel because of the larger tires.

 

So my question is will these new rockstars fit ok with 6 inches of lift? Anyone had them on with a similar set up? Thanks!