X-chock vs. Jack Stabilizers

[Nfrank]

I want to stop the rocking around on my 30ft Cougar and the two products I can find to help eliminate that are X-chocks and jacks stabilizer cross bars. I know both help, but which one helps the most? Has anyone tried both and can give a good comparison? Take a look at these two products I was looking to purchase:

X-chock

Jack Stabilizer

Thanks,
Nathan

[Heelshock]

We have a pair of Fastway's chocks. I recommend them from an easy-way-out point of view.

http://www.fastwaytrailer.com/onestep/