LOL, cyberpine you should get a trophy for the most posts on a single topic.
You started with the same Question back in March 2010 and most of your 176 posts just keep repeating the same thing.
Your second most popular topic is complaining about poor gas mileage...which will
drop significantly when you finally do get your larger tires.
Hope you find what you're looking for soon
I was lucky and got mine right within a month and will get the same again when its time to replace my Nitto's.
I had spacers handy if I needed them, but my shop refused to use them for legal reasons...lucky for me they were not required.
I've had 305/50R20 (12.2" x 32.2") Terra Grapplers on my stock 20"x9" wheels (+19 offset) for over a year now. No spacers, no level or lift....in fact my 10' RCSB 4x4 is dropped 2/3.
In my experience its best to tuck the tire in as close as possible without rubbing, sticking tires out way beyond the fender just looks too redneck to me on a non-lifted truck, specially a 2wd.
a more negative offset may clear the suspension components better, but you risk damaging the corners of your fenders near the door and near the bumper when you do it without a significant lift.
upper A arm clearance
sway bar clearance at full steering lock