That particular truck was made to cart 10-11 meter logs on the back trailer and 5-6 meter logs on the front trailer. Beleive it or not but that is a B Double.\
The advantage that we see here is that A. You dont tow your trailer back to the bush which helps with manouverability and also an empty trailer bouncing down the road can cause alot of stress to the trailer beams and suspension. some of these trailers we built 15 years ago are still full time used. B. Having tha extra weight on the truck makes for a better cabin ride and helps with traction in the bush. Aussie bush roads can be pretty [I have typed a profane word that is automatically changed by the forum censored words program I should know better] so having that extra weight can mean alot. Hope that answers your question mate. Would really like to answer more.