Is the second engine located in the trailer with four axles?
That would be my guess too since it is a "B" unit.
I hope their haul roads are wide! I've read that the Australian road trains whip around quite a bit.
That's why they have "B" trains, it eliminates the dollies.
I can't imagine what it's like when two of the K-monsters meet and pass one another. How long are they?
I think I read where the longest was over 1,200 feet. (apparently there are contests, wouldn't ya know.)
I think a helper-engine arrangement was tried in Oregon a few years ago. Do you know anything about it?
Nope, been out of trucking too long, but remember when Trans Western Express started using triple 27's and 40' doubles.
Also - are the Australian offroad haulers the same giant trucks like were used for British Columbia log hauling on private roads? I saw those in BC long ago, and once saw one like those at a Chevron-Venezuela oilfield. No matter how long I stared at it I couldn't get my head around how big the thing really was. It looked at least half again wider than a road-legal truck.
Those were probably KW-Darts, FWD's, Oshkosh, International 210's. Lots of companies made large off-highway trucks, 6x8's and 8x8's.