What kind of ladder rack?
I know a guy who used to fish La Jolla before attack of the clones, named Katchbait, or Katch something. Anyway he used something like this. Works good if you have only 1 kayak. I used to use the bed of my truck, when I had a 12ft kayak, it was awesome not having to lift it onto a rack. But then I went to a 16ft, then 14ft kayak, so I got Thule racks.
Anyway, here is a one similar that he used.
http://www.harborfreight.com/250-lb-...tm_source=1003