Those are really slick. I have Pingle-style, tubular chock for the trailer and an LP swingarm stand for the paddock. The LP stand is crap - especially for the narrow arm of the B4. One of these days, I'm going to get a Pit Bull for the front and back. The tubular chock works fine for the trailer. It's not as convenient as these drive-in kind but they're also ~$30 shipped.