From what I've seen so far from browsing a lot of vehicles, I thought that the "pro trailer backup assist" feature and the drive mode dial with 4 buttons surrounding it (adding the tx case lock and 4L mode) were a standard part of the HD Tow package. But I came across the one linked below, which apparantly has the package, but is missing these features/controls. Does that sound right?
https://www.zeckfordsales.net/used/Ford/2019-Ford-Expedition-c98e99f60a0e0a171b3402a3c90d78cb.htm#
If it doesn’t have 4L it does not have the Heavy Tow Package. Have them show it to you on the original Window Sticker or build sheet.
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