OD on any tranny Is not ment For to be towing in.
It's not good to tow Esp. a AT tranny thats a good way to Burn it up. Plus it puts a heavier load on the motor/Lugging it. And you surly wouldn't have the power to Pass in OD (when towing)One thing I found out with my Van
Vthing
Is that when towing In OD the MPGs die. It gets better MPGs when In drive Then in OD even On Flat Land not Hills.
Just My2cent.