For the first plow, remove the pins at the top of the hitch bail so the drawbar can move up and down with the plow. When raised, the drawbar would conflict with the PTO, so remove the 2 bolts holding the bearing housing plus the bolt at the other end of the PTO shaft and it comes off.
For the snap coupler plow, I don't recall for certain. Hook it up, raise it carefully, and watch out.
For the hydraulic pull plow, the only one of those I remember had no tail wheel, rather had an adjustable chain hooked from the beam to the tongue which may be hooked too short.