anchor: love.physics.newWheelJoint
  Creates a wheel joint.
  joint = love.physics.newWheelJoint( body1, body2, x, y, ax, ay, collideConnected )
  body1 Body The first body.
  body2 Body The second body.
  x number The x position of the anchor point.
  y number The y position of the anchor point.
  ax number The x position of the axis unit vector.
  ay number The y position of the axis unit vector.
  collideConnected (false) boolean Specifies whether the two bodies should collide with each other.
  joint WheelJoint The new WheelJoint.
  joint = love.physics.newWheelJoint( body1, body2, x1, y1, x2, y2, ax, ay, collideConnected )
  body1 Body The first body.
  body2 Body The second body.
  x1 number The x position of the first anchor point.
  y1 number The y position of the first anchor point.
  x2 number The x position of the second anchor point.
  y2 number The y position of the second anchor point.
  ax number The x position of the axis unit vector.
  ay number The y position of the axis unit vector.
  collideConnected (false) boolean Specifies whether the two bodies should collide with each other.
  joint WheelJoint The new WheelJoint.