We build heaps of trailers at work, everything from Quad bike trailers to 8m Pans + drawbar. We've always done the drawbar length for 4WDs at somewhere around 1350-1450 from the front of the body, although a few have been outside of that. This gives a suitable distance off the tow vehicle to not cause damage when turning and to also allow for ute tray overhang. We've never referenced it to the overall length.
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