An anecdote related to this:
Back around 2004 GM and Ford launched a joint effort to produce a new six speed automatic they would share. One of the design criteria was that it be 4-down towable in both FWD and AWD configuration, and the tranny they produced was indeed towable. It is used in the GM Acadia/Enclave/Traverse and Ford Edge/Explorer. But then it was handed off to another engineering team to produce a lighter, cheaper version for use in smaller vehicles and guess what? The 4-down tow capability got lost, at least in GM models. It appears it was more accidental than intentional, since the vehicles that used the lighter version were announced as being towable, but it turned out that the necessary components had been left out of the revised design. When GM learned about that, they opted to leave it as is rather than fix the design, so they made a conscious cost vs sales tradeoff and gave up a piece of the toad market. Tells you a lot about the value we RVers have as unique car buyers.
2004 American Tradition; 2014 Buick LaCRosse
Homebase in the Ocala Nat'l Forest near Ocala, FL