Yahoo Message Number: 18076 (http://groups.yahoo.com/neo/groups/Country-Coach-Owners/conversations/messages/18076)
I wondered when someone would mention Crossfires. With a large fleet of class 8 tractor/trailers I have used them for years with great success. Very helpful in getting extended mileage out of tires.
While mileage is not generally a concern with the RV crowd, keeping pressure between duals has other advantages, as noted, easy to monitor pressure, easy to fill, and helps keep heat down.
All in all a very good system.