Only issue with tow dolly is that LEAF is a wide car. You need to be careful not to turn too sharp because the U-Haul tow dollies have a turntable for the front wheels. The fenders of the tow dolly could contact the side of the car if you turn too sharp. The LEAF is a heavy car, but it rolls easy on its back wheels. I towed my 2011 across Phoenix on the freeways to participate I the Range Test in September 2012 using a U-Haul tow dolly without incident.
Edited to add: Tony Williams towed his 2012 LEAF using a U-Haul tow dolly from San Diego to Phoenix (and back) for the test.
Silver LEAF 2011 SL rear ended (totaled) by in-attentive driver 1/4/2015 at 50,422 miles
Silver LEAF 2015 SL purchased 2/7/2015