The owners manual is your friend... But I don't think they suggest flat towing an auto... The ones with a manual T-case can be put in neutral for flat towing. But the manual has a section in it. Hope that helps a bit.
you can NOT tow any car flat with an auto tranny, unless it has a manual T-case, and you can put the T-case in neutral. The tranny will be turning and the pump will not be running. You can not even tow it with a 2 wheel dolly on the rear tires. Really I would put it on a trailer because trailer tires cost less the the tires on your truck.