Try Yakima or Thule for options (truck roof mounts). There used to be a company in Canada that sold racks that attach to the front cap's hitch but I think they are now gone. I'm sure that's a risk to add that much weight and stress to the front cap (added hitch pin weight)
I'm not sure I'd recommend attaching them to some assembly that then rides on the ladder. The stresses even for lightweight kayaks might be too much for the ladder and depending on the length of the kayaks, they might exceed height recommendations.
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