just so im sure i understand what you had when you came into it and what you ended up with.... the bag on the passenger side was not firm, soft, and thats what you wanted, so you adjusted the sensor bracket on the drives side, where the bag was firm, to match the angle of the bracket on the passenger side. and you turned it from being perpendicular/parrallel to the frame, to having a few degrees of angle rearward... and the belief as experienced is that this softens the bag based on how the computer is interpreting the values and applying pressure.
where is the compressor on this system? curious if anyone checked proper operation of that compressor. is this a dual system, i think thats what they call it where each side could be at different PSI to level the bed/truck if weight is different passenger to driver side based on where the load is in the bed, or the trailer.
The basic answer to your question is yes - I wanted both bags to match. I started with my truck empty and full of fuel. Passenger bag very soft (deflated) and drivers bag very firm. My goal in all this was to get the drivers bag to deflate so it matched the passenger bag. To do that, I readjusted the sensor on the drivers side - basically adjusting it with the truck running to the point where it deflated the bag. The adjustment was done by loosening the two mounting bolts of the drivers side sensor. Very little change was needed for the bag to deflate and there was enough play in the bolt holes for the adjustment.
A couple updates to my first post. When I first started playing with this, I assumed that the angle of the height sensor arm should be the same for both sides. I now believe that assumption is not accurate due to tolerances in the truck build. I think we've all seen slight differences in wheel well height from right to left on just about any vehicle. After looking at a 2018 Service Manual (newest I could find at AllData) input for the air suspension is based on curb height information. Somehow a curb height is measured and then input into the air suspension control modules. RAM does not provide a way to manually adjust the sensors.
I'd love to find out more about this system, but it seems that many details are top secret. Some additional thoughts....
1. My desire for a soft rear suspension when empty assumes both bags to be empty. That's just how my simple mind is working right now. But.....based on the shop manual specifying that curb height information is entered into the system, RAM may use this system to ensure that the truck is level left to right and they may intentionally inflate one bag to level the truck. Many owners (this forum and others) have mentioned that their drivers bag is inflated and passenger is not leading me to believe that there may be a reason for it.
2. My local dealer had a brand new '21 dually on the lot this weekend so I stopped by. Sure enough, both rear bags were deflated equally.
3. If RAM does use this system to ensure the truck is always level left to right, then my adjustment to lower the drivers bag goes against RAM's intention. In my case, I'm willing to sacrifice a quarter inch difference left to right for a softer ride. This could also explain the wide range of owner reviews on this option. As mentioned earlier, some owners love the rear air, others wish they'd have never ordered it.
4. All this is based on what I've read and my own experience - This is the fine print where I say that I could be all screwed up!
5. I love how my truck rides now.
6. I have not towed or run any heavy loads yet to verify loaded operation of my rear air suspension.
Last of all....if anyone has '19 to '21 service manuals, I'd be grateful if they were willing to send me an electronic copy of the rear suspension section so I could better understand it.