Personally I prefer not to use Bootstrap, but sometimes I must work on templates using it. So had to manipulate site’s layout for larger screen resolution on such Bootstrap 3 template. Therefore I had to extend Bootstrap with extra large classes.
First I made a quick search and didn’t found almost no such projects. So I had to add it myself, that was very easy indeed.
Here I’ve put 2 breakpoints needed to my site, but you may easily change this breakpoints for
container classes and media queries up to your needs. All other items use percents. Than include your CSS file after Bootstrap CSS.
Fork me there.