I was tired of replacing straps and bungees, and did not want to rely on employees knot tying abilities.  I went searching for a better ladder tie-down alternative.  I found a very cool item.  They seem to be used more in Europe, and you can get them cheaper from there on Ebay, but these are made in the US and will get to you quicker.  They also have a cool name.  See pictures below of the "Hook 'Em Danno" ladder locks.