You don't need anything else, the stand secures the bike by the rear axle and holds it in place. I've seen people still strapping their bikes down after putting them in the stand, but I think it's totally unnecessary.The pitbull system is pretty cool. Do you still need a chock for the front wheel, or can you just run a strap through the rim to keep the bike from bouncing?
Yeah it's one of those deals where once you use one, you'll NEVER want to use a strap again! We used to strap 6 bikes down in our race trailer every weekend, it probably took 1/2 hour just to get them all secured. And then you can't easily walk between or around the bikes any longer because there are straps running every whichway. Once we got the Strapless stands, it took about 5 minutes and there's a lot more room to pack other stuff in around the bikes.I've always used Condor stands, Canyon dancers, and straps.... Never have had an issue though. Some of those strapless stands look nice though.