Help with leveling kit info 03 1500 4xr z71

I apologize if there's plenty of Ino already on this topic, but I work 7/12's and trying to get answers as quick as possible.
Has anyone used this brand kit?
Does it use stock shock length?
Should I take it all the way to 3" in the front?
Is it level when finished?
What are your ground to bottom of wheel well measurements when done?
Do 285/17's fit OK after Install?
Thank you.
https://m.ebay.com/itm/2002-2006-Chevy-Avalanche-1500-3-1-5-Full-Lift-Leveling-Kit-Shock-Ext-4x4/140754120218?hash=item20c5996e1a:g:JwoAAOSwevdZ8u4d:sc:USPSPriorityFlatRateBox!43432!US!-1&fits=Year%3A2003%7CMake%3AChevrolet%7CModel%3AAvalanche 1500%7CTrim%3AZ71 Crew Cab Pickup 4-Door%7CEngine%3A5.3L 5328CC 325Cu. In. V8 GAS OHV Naturally Aspirated%7CSubmodel%3AZ71%7CEngine - Liter_Display%3A5.3L&_nkw=leveling+kut+03+avalanche

I would expect the back to still be higher than the front with that kit. If you want it perfectly level I would just use the leveling keys. Because that kit includes the shock extenders, you can use the stock length shocks. I wouldn't crank the torsion keys up all the way after you install the leveling keys because it will not allow the suspension to droop very far without hitting the frame.

Thank you

Anyone else have info on what theyre using and real life measurements??...
Best leveling height and tire size?
Pics would be nice..thanks again all

I want to put new Bilsteins on it..
With a kit like this, do you suggest the 4600's with the shock extenders? Or 5100's without them?
Or...... 5100's with them?...
Appreciate any help.

I have leveling keys with 2in spacer in the rear and 5100 shocks. I think it rides great. I also have E rated 285/70/17 so it feels more like a truck, but still rides very well. I recommend the 5100s, but I've also heard good things about rancho shocks. In my opinion, it's best to get longer shocks and eliminate the shock extenders.

Thank you

I have what is basically the same kit, but I went with the 2" rear spacer.  With the bars almost completely cranked, it sits pretty close to level.  I'm on 33x12.5x20 with no rubbing.  I did have to do some minor trimming on the front bumper.