The trucks arrive to the Old West Town of Yuma and head to the historic Arizona Territory Prison, where prisoners from all over the Wild West were sent. Tyler gives the teams an artichokes and bacon relay challenge, then they must add an original dish starring the two ingredients to their menu and start selling. The residents of Yuma show up strong, with lines of people twenty deep waiting for truck specialties. After a day of massive sales, one team is eliminated and the final three trucks head to the next destination.

The final two teams head back to Los Angeles, where Tyler welcomes them to the historic Pueblo de Los Angeles - the epicenter of L.A.'s Mexican heritage and culture. He introduces Bricia Lopez, co-owner of James Beard-award winning restaurant Guelagetza, and they explain the Mexican ingredients and flavors the trucks will be using in their final stop. First, the teams must create a dish using chayote, then Tyler and Bricia determine which team uses the ingredient best. For the final day selling, habanero peppers are the must-use ingredient and both trucks pull out all the stops for the win - but only one team is awarded the $50,000 grand prize.