I really hadn't noticed many tag axle set ups lately so interesting to see they are still going. Volvo in the early 90's had a tag axle set up from the factory to get added traction they had a switch on the dash to change the ratio of pressure in the airbags from 50/50 to 60/40 in favor of the live axle don't know how well it worked as just took one trip with it while salesman was trying to talk my boss into it. Any way this is getting far from the original question but the longer the thread the more information comes to light.
