So I'm not going back and reading the several pages added lol. I tuned out after I was told I was full of shit and I needed to play with more titties
But my ZR2 bags came in yesterday and I tossed them on today. They seem to fit great, But haven't really tested them yet. BUT I did record a video showing that the freaking pressure Does infact go up in the bags as the suspension is compressed. Crazy that's even a debate. The ZR2 bags are a different part number then the standard bags. Yes they are all black bags that mount to the frame. They all look more or less a like. But they do make different ones. Sort of like shocks. They can look a like but they ain't the same. Does it matter? I don't know. My guess is it does. I doubt airlift just didn't want to sell bags to HD ZR2 and AT4X owners all year for shits and giggles. I doubt they came out with different air spring vs using the ones they already have for no reason.
If you bought a ZR2 for the ride quality, Running cradles and keeping the bags at zero or open will ride better. Open bags are like they aren't even there. When you compress the suspension. Like hit a bump. The pressure in the air springs goes up and adds resistance. The more you compress them the higher the pressure. The higher the pressure the stiffer the bag gets. It seems almost silly to have to say that. It should be obvious. But anyway here is a freaking video of my bags at 5 psi and me lowering a trailer down on the truck. The pressure goes up to 14.5 in only about 1.5". Trailer is 1500lb of tongue weight. Now imagine a 8k truck hitting a big bump and compressing the suspension several inches. What exactly to you think happens to the air spring?, LOL
And BTW at full droop my bags are not touching the cradles. When the truck is sitting on the ground the bags are in the craddles