I'm pretty sure a good amount of procomp and fabtech bracket lifts work like this:
Cecil wants some wheels for his truck.
He goes to 4wp, orders some wide black wheels with a squirrly offset. Maybe some new procomp quadruple x-treme tires for the new wheels. Whats that? I should go 35s? Ok.
Books an appointment, they install the wheels and tires, but guess what? It rubs like a mofo... Cecil feels remorse for the black wheels and MT tires. He can't believe the 22 year old salesmen that told him that they wouldn't rub was wrong.
"How can I fix this?" says Cecil.
Well, you can get a lift kit. 6" lift, $1500. No more rub.
"Ok" says Cecil.
And another silverado er, tacoma, heads to the alignment shop with 3lbs of weights on their new wheels.