I pull a Black Machine 12 row with liquid fert. behind a 85 P.T.O. horsepower F.W.A. tractor.
It is a load, but can pull it at 5 M.P.H. when no-tilling. I only have 3 miles of road travel between farms, but that is the scary part. I plan things so the planter is nearly empty for road travel and don't go more than 10-12 M.P.H. or things can get squirrelly when stopping.