I did it for two summers at about 20K miles. I was right at 65' and from AZ to Mi I was fine but when we went to Baltimore to see my daughter we left the Geo in Mi. Eastern states are strict on length and some don't even allow it. What most don't understand is two ball joints are not allowed. Only a king pin and then a ball is allowed. Now that I have a longer MS I'm leaving the Geo at home because I would be to long. If you have all four wheels on the ground there is zero tongue weight. The Geo only weighs 2,300#. Here is some interesting reading.
http://rvtravel.com/blog/jerry/2007/...riple-tow.html
http://www.readybrake.com/state-towing-laws.html