Offset for Silverado, bagged, tall tires

I have a bagged 2002 Silverado with 20 inch rims but I have to run 255/35/20 tires because when I lay out in the back there is barely enough room(width). I have already trimmed the fender lip as slim as possible. I have rims with about a 2 inch lip. I want to get new 20 or 22s that will set inside wheelwell farther so I can run 40 or 45 series tires. I have removed/moved fenderwells and have room for tall tires. I need to know offset and who makes rims to make it happen.

yeah im buting wheels next week, What offset and backspacing for a 22 in front and rear do I need to run...

someone help me out here is all the info on the whll I am buying as long as it will tuck..I will run a 35 series tire, on the 22


Wheel Name
JUICE 6 (EMR 241) - RWD

Wheel Size
18x8.5 20x9.5 22x9.5

Wheel Finish
Chrome


US PATENT #D471-499



Part Number Wheel Size PCD Cap Code Center Bore Offset Back Side



241 885 645 +14 18 x 8.5 6 x 114.3 9 72.56 +14 5.30"
241 885 655 +14 18 x 8.5 6 x 139.7 9 110 +14 5.30"
241 295 645 +10 20 x 9.5 6 x 114.3 9 72.56 +10 5.64"
241 295 655 +10 20 x 9.5 6 x 139.7 9 110 +10 5.64"
241 095 550 +10 22 x 9.5 5 x 127 9 83.7 +10 5.64"
241 095 553 +10 22 x 9.5 5 x 135 9 87 +10 5.64"
241 095 655 +10 22 x 9.5 6 x 139.7 9 110 +10 5.64"