The front leaf springs on my coach have started going into negative arches from years of overloading by the previous owners. Last year I couldn't find a shop that would replace the springs for me so for an intermediate fix, I added the Ride Rite air bags and an on-board wireless-controlled compressor. Except for very uneven road surfaces, you'd never know there was anything wrong with the springs after I added the air bags. I can inflate them individually, so since the driver's side spring is more worn that the passenger side, I inflate it with a higher pressure and the ride height evens out nicely. There's still a significant lean with the bags deflated and as I said, on uneven road surfaces, you definitely know something's not right, but I'm sold on the airbag helper springs.
This year, I've finally found a local shop that can replace the springs for me so I'll have that done before we head out on the road again, but will leave the air bags in place to assist the ride and the sway. I also have rear bags that I haven't installed yet, so I'll probably put them on at the same time as I replace the springs.