Max tire size on 18'' factory rims?

[pafb]

Bought a 2020 2500HD last December. It came with 18'' rims with 275/70-18 tires. I would like to put bigger tires under it. I plan on installing a leveling kit

on it eventually which will be a 3'' lift in front, 2'' lift in rear. Will 295/70-18 and 305/65-18 fit without leveling kit? Thanks in advance for any feed back.  

[2011Chevy]

Either of those sizes will fit without a lift or level.  I have a 3” super lift and 37’s on factory 18’s and it only rubs at full lock.  My truck looked exactly the same as yours when it got to the dealer, right down to the color and wheels.

[pafb]

Thank you for the reply. Guess I'll do some tire shopping 

[Bjorg]

I'm currently customizing my 2017 Chevrolet Silverado and intend to buy new tires from 4WheelOnline. Can anyone recommend the best tire brand for my truck?