Steering lock ?

[rocco16 at sbcglobal.net (LEF)]

Because both front wheels have built-in castor, they will each, individually, independently, faithfully follow the tow car.
If one "unlinked" wheel will turn, they both will.  You really don't need them "in sync".  They'll do far better on their own...it's called Ackermann.
 If you'd like to keep them linked together via the steering rack, that's fine.  But let it be for the right reason(s).

Larry
sandiego16v



  For a flat tow, where all 4 wheels remain on the pavement, it would
  seem to be a better idea to keep the front wheels connected so
  the two tires would be pointed in the same direction all the time.
  I suspect it would also help going around corners, instead of having
  each of them be able to twist free by disconnecting the tie
  rods.  That would make it more difficult to turn without 
  scrubbing at least one tire because it wasn't turning in sync
  with the other side.