What does your manual say? There should be a complete section on flat/dingy towing that specifically states the steps to take if authorized. Some do not facilitate flat towing no matter what.
Each vehicle is a little different but I've flat towed multiple US vehicles and NEVER racked up miles on the OD. I'm pretty sure there is a way to correct this feature.
Drive safe - Richard
2011 Itasca Ellipse 42QD; 2012 Buick La Crosse; Retired US Army MSG (20 years AFS); Retired! Retired!