Tasty Kabob listed a 5th truck in today’s tweet, so I can only assume that means that they launched a fifth truck!  The fifth truck is not yet listed on the schedule on their website, so I’ll probably have to wait a few days to confirm that 5 trucks will always be serving at one time.

This fifth truck puts Tasty Kabob into a class of its own with the most trucks that one company has in operation at one time.  Their closest competitor with respect to number of trucks is Sauca, which used to have 4 trucks in operation at one time.  They have since scaled back to 1 or 2 trucks per day ever since the Sauca restaurant opened.

UPDATE (1/5/2012): This is indeed their 5th truck.