Cheap car to tow is not an option - usually have 8 people (4 Godkids, 2 Parents, 1 Grand Parent or Nanny and ME) plus team practice gear, when we go. And we go all the time to Softball and Baseball tourneys.
The manual says to lock the steering wheel and leave the car in park when towing rear wheels up. I confirmed with the chevy manuf that there is no milage limit on towing rear wheels up.
I finally found one that has the width and weight capacity and the tires move like car tires so no central pivot or turning fenders. Landgrebe Manufacturing, Indiana.
I still have some more questions for the company but I think this might be my answer. Will let you know how it goes. Was just lucky to run across a link to this site.