I want to make some pages fullsize(over the 1024px the now are)
For the page's I have disabled the right sidebar already.

This is the example page

I would like the tables on the page to stretch more

Just make the tables 100% width.

Thanks lmilesw for replying
The tables are !00% width. But my ata settings - Layout MAX width is 1024px

I am not sure what you are trying to do.

I've set the width on 1024 px for al ata pages and posts.
But am wondering if I can make exceptions for some pages like the example page mentioned above. I would like some pages to be 1400 px width

You might be able to fiddle with CSS to do that but I am not sure of all the CSS you may have to use without a fair amount of testing. I would just play with Firebug to test possibilities.