There's a lot on line, including some commercial items made specifically for this purpose. Google "RV Ladder Kayak Mount" for more info.
From a DIY standpoint, I would think that, for such a light kayak, you could simply strap it to the ladder with some nylon cargo straps, making sure they're woven through the ladder's rungs so they don't slip down. You'll probably need a small step ladder to reach the upper strap. The weight will be supported by your hitch rack so this doesn't need to be elaborate.
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Bob C
2002 Itasca Suncruiser 35U
Workhorse Chassis
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