This came out before the Pit Bull System.
Works basically the same except I think the Strapless System actually lifts the rear tire off the ground. The other issue is that the bike has to be pulled back onto this sytem rather than being pushed into place.
I've seen the Pit Bull in action and it seems like about the easiest possible way to load 'n' lock a bike.
The only draw back saw with the PB was that it takes up extra space because the bracket hangs behind the bike.
Then I saw a pic of a guy that had it mounted in front of the rear tire and felt retarded.
I just realized I have spent way too much time and energy on this post.
The Pit Bull system will be in my next trailer.