Doc,
The link I tried to post didn’t make it last time. Probably because I forgot...but that’s another story.
http://www.donvel.com/steeraxle.htm
Considering your last post this may not work with your current leaf spring set up but perhaps a solution to controlling the motion if you remove a leaf and add the air bags up front.
Just a thought. These guys seem to be pretty knowledgeable and may be a good source of additional information on the topic.
Rad