1. Make peach balsamic vinaigrette. In a small mixing bowl, whisk together ingredients from oil to mustard and set aside.
2. Preheat grill to medium heat. On a cutting board, season pork tenderloin spice rub. Rub, enough to sprinkle generously on all sides.
3. Lay the pork tenderloin on a 45° angle and grill for 3 minutes per side, then flip to the opposite 45° angle to form cross-hatch grill marks and continue cooking for 3 minutes per side, about 18 minutes total. The pork is done when the internal temperature has reached 140-145°F. Transfer to a cutting board, cover and let rest for at least 5 minutes.
4. Meanwhile, assemble the salad. In a large serving bowl, combine lettuce, cucumber, tomatoes, radishes, peaches, and half of the fresh herbs.5. Slice tenderloin into thin slices. Toss salad with the dressing. Top with remaining fresh herbs, pita chips, and sliced pork tenderloin.