I've used a Schneller cart since 2003. Pushed and dragged it all over the U.S. Get the stool lock, eventually it will fold up on you and you'll dump your rifle out of the vertical rack. Usually happens when you're pulling it up an embankment. Happened twice to me before Schneller offered the lock. The other thing you'll want to do is put some "slime" or whatever they use now in the tires to keep from getting a flat. When I first got mine, I got stickers in the tires at Sacramento and both tires were flat. I patched them and used the green slime stuff and have never had a problem.
Mike Miller
DR #1724
President's Hundred