Geeesh.... DB. Well it took some digging but I found the details. A little confusing looking this up because other attempts at the record were coming up with it.
Here is a website with Details:
http://www.gouldtransport.com.au/world_records.htmlTrailers were Empty.
Total weight of the rig was 1300 tonnes (1433 U.S. tons. - 2,866,000 lbs.)
Had to travel 100 Meters to set the record. 6ths of a mile.
In a straight line.
It was to raise money for a Charitable Cause.
Doesn't say how many, but they had to use mulitple air compressors to air up the entire system of brakes.