I do this when i carry my disk harrow or feild cultivator up front on the trailer (16 ft tandem dovetail carhauler) My yanmar 2000 sits rear tires just over rear axle and tractor centered on the axles. I have a 6 ft peice of RR tract that i use as weight up front so i think trailer is pretty well balenced. But My BH hangs off the back several feet but due to the rearward tractor and the dovetail when i let the BH down to the deck it comes close the the road and will hit going over bumps or tuning into the driveway at like gas stations, this is not a problem except i strap my BH down to keep it from flopping on the trailer and this upward force busts my straps. My solution is to put the spare tire on the dovetail portion and very back of flat dect and rest the BH on it so that it kicks it up in the air. Keeps the tail wheel from dragging and is good as having an 18 ft trailer except that im hanging in the air.
-Nate