33X12.5X18 Tires on stock wheels with 2.5" level

[mkenum79]

I know this has probably been asked 1,000,000 times, but would I be able to fit 33X12.5's on the factory 18's without any clearance issues on my 2015 GMC Sierra with 2.5" level?  I'm pretty sure I'll get into the swaybar some but concerned about the UCA's. If I added 1/4" spacers would that get me the clearance I need?

[rcr2016z71]

Thinking about going with the same setup as you, RC 2.5" leveling kit with 33x12.5's on factory 18's.  Did you have any fitment issues, or need to add wheel spacers?  How do you like the RC leveling kit?