The GM solution is a whole lot better than nothing, but it's not great. First off, it's still umpteen feet off the ground, and it's not very big. Try it with Sorels on...
The Ford solution (if it's what I'm thinking of) is fine unless you don't want to, or can't, open the tailgate.
The Ram solution, while it is optional (unlike the GM, not sure about Ford) is large, low enough for even this old geezer to find relatively comfortable, and equally effective whether the tailgate is open or closed. The only downside I've found is that it's easy to forget to reset it, and you drive around looking like a dork.