Hey guy's so I'm wanting to put the rough country 4.75 inch combo lift on my truck and upgrade the wheels and tires...but I'm really confused on what I need to do...I already have a 2" rough country leveling kit? will that affect the 4.75 lift at all? If it doesn't affect everything and I get the kit installed, GREAT! but my next problem is..choosing wheels and tires...it says I will need a wheel backspacing of 5.5-6"...What is the backspacing on stock chevy rims? Second question When I look tires up online...and it says that the rim is 20x9...what does the 9 mean? and some sites show the offset of being 35...is the 35mm? Are backspacing and offset connected somehow? Sorry for all the questions...if there's a write up on all this someone could lead me to that would be great, or if someone could show me a link to the set of XD rockstars with 33" tires that would fit a my truck that would be great. Cheers, and thanks in advance for anyone who takes the time to help me out Matt.