[Paddlewise] security

Hello,
I have recently picked up a couple of recreational kayaks and will soon be 
taking a trip halfway across the country. I have a Yakima setup on top of a 
Suburban and I was wondering what others do for security. We'll be stopping 
5 times between here (Illinois) and there (Washington) and I don't want to 
try stuffing them in a hotel room with us. I was pondering using something 
akin to a bike cable/chain to lock the seat mounts to the factory rack 
(doesn't come off). Anyone tried this?  Any other security measures I can take?

Any advice is greatly appreciated.

Thanks,
Ray
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