I’ve seen a few guides (including one or two stackoverflow questions), but pretty much all say that this is a fix for 1.4 that is built into 2.*.
Working from the fluid example I tried adding the pull-right attribute to various levels of the divs with no success.
How do I get a right-sidebar with Twitter Bootstrap 2?
You can get a fluid three-column bootstrap setup by simply laying out three divs that equal the highest possible grid setup there is, which is
.span12. So in this case we used three divs, 2x sidebar.span3divs + 1x.span6content div and all equals 12.HTML
Demo: http://jsfiddle.net/6vPqA/89/