Harbor Freight tools sells similar suction thingies..
Here is one idea using them, this could be modified to have actual wheels mounted to it like the one advertised. (You can also find wheels at Harbor Freight on the cheap) Actually if you read through the thread at this link, you will see some mods including one with wheels..
http://www.texaskayakfisherman.com/f...?f=53&t=103508