When I would love to have air suspension on my F350 and I followed the pictorial on this forum showing the conversion, it is costly addition to not too cheap new truck, while putting warranty in question.
So I went for alternative Sulastic Hangers, who did smooth empty ride.
Probably the best $300 I spend on my combo.
On my bus conversion air bags gave me about 8" of total adjustment, or +5 and -3. That was nice for leveling, but aged system in the rear leaked, so I had to put rocks under after getting it level.
That made for rock-solid stay while camping ;)