trowe,
I have absolutely no experience but have spent a large part of the last several years studying this and other sites.. the term PING TANK seems to come to mind.. a rigid expansion tank hooked inline with your suspension.. it will not decrease your weight carrying capacity appreciably,but will make the ride softer.. as I understand it a small air tank (maybe 10 gallons)like the portable ones used to air up a tire, with the largest diameter connections practical is what you want. search on this site and google on the net and you will find a lot of information. here are a couple of links
oo landline
in my search I found this very good article by our pioneer Larry Z.. the interesting thing is that Warpath's avatar has changed to the new one.. I was kinda hoping for the nostalgia of the old one that was on there the first time I read it.LOL
Larry Z's article