The Aspire is a front wheel drive, isn't it? I towed a manual Aspire for a brief time (no mods necessary), but never looked at an automatic. Is it easy to disconnect a front drive transaxle?
Seems to me like the easiest solution is to run the engine while towing it. The Aspire uses so little fuel, you probably won't even notice. I would stop periodically and run it through the gears, though, so that hydraulic fluid circulated to all part of the tranny.
2004 American Tradition; 2014 Buick LaCRosse
Homebase in the Ocala Nat'l Forest near Ocala, FL