I
  got tired of trying to move the trailer around on the small tongue wheel, so
  $50 later I have a trailer dolly!  It only came with a 1 7/8" ball,
  but I have never had a problem using it in the driveway with my 2"
  coupler on the Santa Fe.  It has a 600 pound tongue weight and 12'' x 4''
  pneumatic knobby tires which move our pop up very well.