I don't have the four cyl. . So this may be of no help. One I've towed my Edge with the six cyl. For three years now towing four down. Just remembering to start the engine at fuel and rest stops. No issues. Give REMCO Co. A call they make the transmission systems with lube pump enabling most vehicles to be towed. They will verify if your Edge is indeed towable and if not what their system will cost. It's not cheap, probably the same as a trailer dolly?
Clay & Pebble.. Miss Butter our sweet Goldie (Jan. 2005-Jan. 2015) Sissy our Border Collie
2012 Providence 42 M. Spartan Chassis, 450 ISL
Ford Edge toad, RM All Terrane, TST TPMS, SMI Air Force One, RVM95....