our law dont allow more than one trailer but combination like 6x2*4 (with steerable tag axle ) and 2axle drawbar trailer is far best thing for this approved by law
http://www.youtube.com/watch?v=BUTxPKBOAHk&feature=related that would kick ### on the windy road. I hauled the trial trailer a long while ago.. it tracks within 50 cm of the prime mover wheels.
Why is that trailer so high??? http://www.youtube.com/watch?v=yhN73Qwia24&feature=channel_video_title This one is much lower and also extantable. When some trailers of my father are coming home, i will make some photo's of a enforced steering system.
something interesting on first sight look like standard man f/fe2000 but this one is Unterflur that means this is not COE , and engine is placed between axles and it is horizontally placed .....and in this serie of trucks man did not offer this so all of those from images are converted from COE to unterflur http://www.youtube.com/watch?v=E33RBAaf7xU http://www.youtube.com/watch?v=_rt_6ASkGKY
i dont like bertoja trailers ( they are from italy and i dont like anything from them including them but this trailer have 13+ ton axle capacity and 35-6ton 5th wheel and it is actually pretty high comparing to other trailers that is almost 310000lbs without tractor weight i dont see any reason for high trailer like that one
australia have good trailer industry really innovative products , as mechanical engineering stdent and truck driver i know it is easily to make straight trailer than step deck or anything lower than straight but there is not too many heavy and long loads which are low this is image of truck from my town , for similar usage those guys often drive long prefab concrete elements