Interesting. The e-brake on my Fiero does a better job of holding the Fiero when in reverse than in drive.
Both of my trucks did hold in reverse. My truck will again, after the backing plates are replaced. My wife's truck needs brakes. The code enforcement gestapo is going on vacation, so I plan to do the brakes on her truck then.
My Cavalier held. Both Blazers, and the Bravada held. My old Tahoe held. The other GM cars I had were all manuals.