Cut chicken thighs into 2 inch chunks.
Slice zucchini and onion. Cut bell peppers into chunks.
Thread chicken and vegetables alternating onto skewers.
Place on a clean baking pan and set aside.
Prepare the vinaigrette marinade by combining olive oil, cider vinegar, brown sugar, dijon mustard and seasonings into a bowl. Whisk until well combined.
Reserve 1/4 cup of vinaigrette for serving.
Brush kebabs on all sides with marinade.
Prepare grill fire to 300° with oak wood for smoke flavoring.
Place kebabs over indirect heat and cook for 5 minutes with the lid closed.
Brush with marinade, flip and brush the other side with marinade. Close the lid and cook another 20-25 minutes or until internal temperature reaches 165°.
Remove from grill and allow to rest 5 minutes before serving.
Drizzle with reserved vinaigrette if desired.