I started a thread previously regarding this, but I hadn't run across some of the suggestions bestatchess provided. Here is another one:
Slide-N-Lock - Track and Tie downs only - may require drilling.
http://www.americanvan.com/catalog/...fm?FamilyID=103
My orginal thread is located at
UtiliTrack Alternatives
I believe someone posted a source for the slide-n-lock system there.