I hear that the teams set up two tandem pit boxes in front of each garage during some practice sessions but not during quali or the race. I am unaware of any rules forbidding double pit boxes during the races and even vaguely remember Toyota using a dual box set up at some time in the past. We know that there always two fuel rigs ready to go for each driver.
In races with a high Safety Car probability might it be advantageous to use a dual set up in order to avoid stacking up like that which ruined Kovalainen's race?