Here is a mobile rack that you can make to store your yak on along with other gear.
http://www.kayakfishinghole.com/comm...ead.php?t=1179
Here is another (not mobile):
http://www.stacksandstacks.com/delux..._content=40030
I have one of my yaks hanging from a hoist so its out of the way and the other, well just sits half on a crate and the other half on the yak cart. I know this is not ideal, but don't have the room to hang the second. Oh and no deformation on the hull either.