Over the past 20 years of owning beach cats, I have used about all. I like the kayak cradle idea, haven't tried that one yet.

I usually use a large piece of styrofoam, from some shipment box, at work, or elsewhere, and change it about once a year. It's FREE, works well, I often cut the appropriate grooves in it with a serrated kitchen knife. I hold it with a bungee.