I have a 2001 Winnebago Brave 30 W. It had air bags in the front springs but always sat slightly low in front. We were on a trip and both front bags failed which let it sit really low. We finished the trip like that and when I got home I ordered new springs from Henderson Steer Safe. I put them in myself, it was a fairly big job, but well worth it. It sits up like it should and rides and drives better than ever. You have to weigh the front end and they will send the proper springs based on the weight. The front end then has to be re-aligned. The cost for the springs was a little over $500 if I remember right and the alignment was somewhere around $100+. I am very satisfied with the new springs. If you are not mechanically inclined with a place to work, the alignment shop could probably install them.
Edit: I just checked and I think the springs are called super steer not steer safe and they are priced at $360 a pr on Henderson's web site.
Just google Henderson super steer.