The real investorettes quest - level 50
The Pita Vans aren't part of Level 50. Here's the walk-through: http://forum.ea.com/eaforum/posts/list/10309516.page
Forum Discussion
It looks like you've gotten the quests confused, probably because you unlocked Helen and Luann so close together. "The Investorettes" is the questline that begins after you buy the Cracker Factory, and in The Investorettes Pt. 2 you'll be able to buy and place Fleet-A-Pitas. "The Real Investorettes" is Helen's questline for Level 50, and it does NOT unlock the Fleet-A-Pitas.
